78957747 has 48 divisors (see below), whose sum is σ = 130690560. Its totient is φ = 47239200.

The previous prime is 78957727. The next prime is 78957763. The reversal of 78957747 is 74775987.

It is not a de Polignac number, because 78957747 - 2²⁰ = 77909171 is a prime.

It is a super-2 number, since 2×78957747² = 12468651622632018, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78957693 and 78957702.

It is not an unprimeable number, because it can be changed into a prime (78957727) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 291222 + ... + 291492.

It is an arithmetic number, because the mean of its divisors is an integer number (2722720).

Almost surely, 2^78957747 is an apocalyptic number.

78957747 is a deficient number, since it is larger than the sum of its proper divisors (51732813).

78957747 is a wasteful number, since it uses less digits than its factorization.

78957747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406 (or 394 counting only the distinct ones).

The product of its digits is 3457440, while the sum is 54.

The square root of 78957747 is about 8885.8171824543. The cubic root of 78957747 is about 429.0075307984.

The spelling of 78957747 in words is "seventy-eight million, nine hundred fifty-seven thousand, seven hundred forty-seven".