78396738 has 32 divisors (see below), whose sum is σ = 179625600. Its totient is φ = 22344960.

The previous prime is 78396701. The next prime is 78396739. The reversal of 78396738 is 83769387.

It is a super-2 number, since 2×78396738² = 12292097058081288, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78396739) 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, 17338 + ... + 21386.

It is an arithmetic number, because the mean of its divisors is an integer number (5613300).

Almost surely, 2^78396738 is an apocalyptic number.

78396738 is an abundant number, since it is smaller than the sum of its proper divisors (101228862).

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

78396738 is a wasteful number, since it uses less digits than its factorization.

78396738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4522.

The product of its digits is 1524096, while the sum is 51.

The square root of 78396738 is about 8854.1932438817. The cubic root of 78396738 is about 427.9890562608.

The spelling of 78396738 in words is "seventy-eight million, three hundred ninety-six thousand, seven hundred thirty-eight".