78296640 has 56 divisors (see below), whose sum is σ = 248594880. Its totient is φ = 20878848.

The previous prime is 78296629. The next prime is 78296641. The reversal of 78296640 is 4669287.

It is a super-2 number, since 2×78296640² = 12260727670579200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78296592 and 78296601.

It is not an unprimeable number, because it can be changed into a prime (78296641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39820 + ... + 41739.

Almost surely, 2^78296640 is an apocalyptic number.

It is an amenable number.

78296640 is an abundant number, since it is smaller than the sum of its proper divisors (170298240).

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

78296640 is a wasteful number, since it uses less digits than its factorization.

78296640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81579 (or 81569 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 78296640 is about 8848.5388624337. The cubic root of 78296640 is about 427.8068246363.

The spelling of 78296640 in words is "seventy-eight million, two hundred ninety-six thousand, six hundred forty".