78396640036 has 135 divisors (see below), whose sum is σ = 165270975555. Its totient is φ = 32524103040.

The previous prime is 78396640019. The next prime is 78396640051. The reversal of 78396640036 is 63004669387.

The square root of 78396640036 is 279994.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 34273116900 + 44123523136 = 185130^2 + 210056^2 .

It is a super-2 number, since 2×78396640036² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 880861080 + ... + 880861168.

Almost surely, 2^78396640036 is an apocalyptic number.

78396640036 is the 279994-th square number.

It is an amenable number.

78396640036 is an abundant number, since it is smaller than the sum of its proper divisors (86874335519).

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

78396640036 is an equidigital number, since it uses as much as digits as its factorization.

78396640036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 52.

The spelling of 78396640036 in words is "seventy-eight billion, three hundred ninety-six million, six hundred forty thousand, thirty-six".