78842190 has 128 divisors (see below), whose sum is σ = 226759680. Its totient is φ = 17169408.

The previous prime is 78842189. The next prime is 78842249. The reversal of 78842190 is 9124887.

It is a super-2 number, since 2×78842190² = 12432181847992200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 567141 + ... + 567279.

It is an arithmetic number, because the mean of its divisors is an integer number (1771560).

Almost surely, 2^78842190 is an apocalyptic number.

78842190 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 78842190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113379840).

78842190 is an abundant number, since it is smaller than the sum of its proper divisors (147917490).

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

78842190 is a wasteful number, since it uses less digits than its factorization.

78842190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 78842190 is about 8879.3124733844. The cubic root of 78842190 is about 428.7981402085.

The spelling of 78842190 in words is "seventy-eight million, eight hundred forty-two thousand, one hundred ninety".