78979550 has 24 divisors (see below), whose sum is σ = 158203416. Its totient is φ = 29161440.

The previous prime is 78979469. The next prime is 78979553. The reversal of 78979550 is 5597987.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78979553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60104 + ... + 61403.

It is an arithmetic number, because the mean of its divisors is an integer number (6591809).

Almost surely, 2^78979550 is an apocalyptic number.

78979550 is an abundant number, since it is smaller than the sum of its proper divisors (79223866).

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

78979550 is a wasteful number, since it uses less digits than its factorization.

78979550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121532 (or 121527 counting only the distinct ones).

The product of its (nonzero) digits is 793800, while the sum is 50.

The square root of 78979550 is about 8887.0439404787. The cubic root of 78979550 is about 429.0470151671.

The spelling of 78979550 in words is "seventy-eight million, nine hundred seventy-nine thousand, five hundred fifty".