72977637 has 4 divisors (see below), whose sum is σ = 97303520. Its totient is φ = 48651756.

The previous prime is 72977621. The next prime is 72977647. The reversal of 72977637 is 73677927.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 73677927 = 3 ⋅24559309.

It is not a de Polignac number, because 72977637 - 2⁴ = 72977621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72977647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12162937 + ... + 12162942.

It is an arithmetic number, because the mean of its divisors is an integer number (24325880).

Almost surely, 2^72977637 is an apocalyptic number.

It is an amenable number.

72977637 is a deficient number, since it is larger than the sum of its proper divisors (24325883).

72977637 is a wasteful number, since it uses less digits than its factorization.

72977637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24325882.

The product of its digits is 777924, while the sum is 48.

The square root of 72977637 is about 8542.6949494875. The cubic root of 72977637 is about 417.8912383103.

The spelling of 72977637 in words is "seventy-two million, nine hundred seventy-seven thousand, six hundred thirty-seven".