78417536 has 16 divisors (see below), whose sum is σ = 156222690. Its totient is φ = 39208704.

The previous prime is 78417529. The next prime is 78417553. The reversal of 78417536 is 63571487.

It can be written as a sum of positive squares in only one way, i.e., 76457536 + 1960000 = 8744^2 + 1400^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×78417536² = 12298619904622592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78417493 and 78417502.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306191 + ... + 306446.

Almost surely, 2^78417536 is an apocalyptic number.

It is an amenable number.

78417536 is a deficient number, since it is larger than the sum of its proper divisors (77805154).

78417536 is an equidigital number, since it uses as much as digits as its factorization.

78417536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612651 (or 612639 counting only the distinct ones).

The product of its digits is 141120, while the sum is 41.

The square root of 78417536 is about 8855.3676377664. The cubic root of 78417536 is about 428.0269002221.

The spelling of 78417536 in words is "seventy-eight million, four hundred seventeen thousand, five hundred thirty-six".