78520328 has 8 divisors (see below), whose sum is σ = 147225630. Its totient is φ = 39260160.

The previous prime is 78520231. The next prime is 78520349. The reversal of 78520328 is 82302587.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 76772644 + 1747684 = 8762^2 + 1322^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4907513 + ... + 4907528.

Almost surely, 2^78520328 is an apocalyptic number.

It is an amenable number.

78520328 is a deficient number, since it is larger than the sum of its proper divisors (68705302).

78520328 is a wasteful number, since it uses less digits than its factorization.

78520328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9815047 (or 9815043 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 78520328 is about 8861.1696744843. The cubic root of 78520328 is about 428.2138419567.

The spelling of 78520328 in words is "seventy-eight million, five hundred twenty thousand, three hundred twenty-eight".