79977550 has 24 divisors (see below), whose sum is σ = 151927776. Its totient is φ = 31309440.

The previous prime is 79977539. The next prime is 79977553. The reversal of 79977550 is 5577997.

It is a junction number, because it is equal to n+sod(n) for n = 79977494 and 79977503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79977553) 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, 14667 + ... + 19366.

It is an arithmetic number, because the mean of its divisors is an integer number (6330324).

Almost surely, 2^79977550 is an apocalyptic number.

79977550 is a deficient number, since it is larger than the sum of its proper divisors (71950226).

79977550 is a wasteful number, since it uses less digits than its factorization.

79977550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34092 (or 34087 counting only the distinct ones).

The product of its (nonzero) digits is 694575, while the sum is 49.

The square root of 79977550 is about 8943.0168287888. The cubic root of 79977550 is about 430.8466283532.

The spelling of 79977550 in words is "seventy-nine million, nine hundred seventy-seven thousand, five hundred fifty".