78398064 has 80 divisors (see below), whose sum is σ = 226548000. Its totient is φ = 25956864.

The previous prime is 78398059. The next prime is 78398069. The reversal of 78398064 is 46089387.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78398059) and next prime (78398069).

It is a super-2 number, since 2×78398064² = 12292512877896192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78398069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74212 + ... + 75260.

It is an arithmetic number, because the mean of its divisors is an integer number (2831850).

Almost surely, 2^78398064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78398064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113274000).

78398064 is an abundant number, since it is smaller than the sum of its proper divisors (148149936).

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

78398064 is a wasteful number, since it uses less digits than its factorization.

78398064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239 (or 1227 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 78398064 is about 8854.2681233403. The cubic root of 78398064 is about 427.9914692451.

The spelling of 78398064 in words is "seventy-eight million, three hundred ninety-eight thousand, sixty-four".