78979957 has 4 divisors (see below), whose sum is σ = 90262816. Its totient is φ = 67697100.

The previous prime is 78979951. The next prime is 78979961. The reversal of 78979957 is 75997987.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78979957 - 2⁷ = 78979829 is a prime.

It is a super-3 number, since 3×78979957³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78979895 and 78979904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78979951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5641419 + ... + 5641432.

It is an arithmetic number, because the mean of its divisors is an integer number (22565704).

Almost surely, 2^78979957 is an apocalyptic number.

It is an amenable number.

78979957 is a deficient number, since it is larger than the sum of its proper divisors (11282859).

78979957 is a wasteful number, since it uses less digits than its factorization.

78979957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11282858.

The product of its digits is 10001880, while the sum is 61.

The square root of 78979957 is about 8887.0668389520. The cubic root of 78979957 is about 429.0477521588.

The spelling of 78979957 in words is "seventy-eight million, nine hundred seventy-nine thousand, nine hundred fifty-seven".