78398250 has 128 divisors (see below), whose sum is σ = 227335680. Its totient is φ = 17625600.

The previous prime is 78398249. The next prime is 78398251. The reversal of 78398250 is 5289387.

It is an interprime number because it is at equal distance from previous prime (78398249) and next prime (78398251).

It is a super-2 number, since 2×78398250² = 12292571206125000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (78398251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 572182 + ... + 572318.

It is an arithmetic number, because the mean of its divisors is an integer number (1776060).

Almost surely, 2^78398250 is an apocalyptic number.

78398250 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 78398250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113667840).

78398250 is an abundant number, since it is smaller than the sum of its proper divisors (148937430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78398250 is a wasteful number, since it uses less digits than its factorization.

78398250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273 (or 263 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 78398250 is about 8854.2786267431. The cubic root of 78398250 is about 427.9918077158.

The spelling of 78398250 in words is "seventy-eight million, three hundred ninety-eight thousand, two hundred fifty".