78365690 has 32 divisors (see below), whose sum is σ = 159909120. Its totient is φ = 27411264.

The previous prime is 78365689. The next prime is 78365717. The reversal of 78365690 is 9656387.

It is a super-2 number, since 2×78365690² = 12282362738352200, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13394 + ... + 18333.

It is an arithmetic number, because the mean of its divisors is an integer number (4997160).

Almost surely, 2^78365690 is an apocalyptic number.

78365690 is an abundant number, since it is smaller than the sum of its proper divisors (81543430).

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

78365690 is a wasteful number, since it uses less digits than its factorization.

78365690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31766.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 78365690 is about 8852.4397766943. The cubic root of 78365690 is about 427.9325489828.

The spelling of 78365690 in words is "seventy-eight million, three hundred sixty-five thousand, six hundred ninety".