72977969 has 4 divisors (see below), whose sum is σ = 73168896. Its totient is φ = 72787044.

The previous prime is 72977951. The next prime is 72978001. The reversal of 72977969 is 96977927.

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 72977969 - 2⁸ = 72977713 is a prime.

It is a super-2 number, since 2×72977969² = 10651567918729922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72977939) 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, 94889 + ... + 95654.

It is an arithmetic number, because the mean of its divisors is an integer number (18292224).

Almost surely, 2^72977969 is an apocalyptic number.

It is an amenable number.

72977969 is a deficient number, since it is larger than the sum of its proper divisors (190927).

72977969 is a wasteful number, since it uses less digits than its factorization.

72977969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190926.

The product of its digits is 3000564, while the sum is 56.

The square root of 72977969 is about 8542.7143812725. The cubic root of 72977969 is about 417.8918720190.

The spelling of 72977969 in words is "seventy-two million, nine hundred seventy-seven thousand, nine hundred sixty-nine".