72377621 has 4 divisors (see below), whose sum is σ = 73457952. Its totient is φ = 71297292.

The previous prime is 72377611. The next prime is 72377629. The reversal of 72377621 is 12677327.

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 a de Polignac number, because none of the positive numbers 2^k-72377621 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 (72377629) 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, 540065 + ... + 540198.

It is an arithmetic number, because the mean of its divisors is an integer number (18364488).

Almost surely, 2^72377621 is an apocalyptic number.

It is an amenable number.

72377621 is a deficient number, since it is larger than the sum of its proper divisors (1080331).

72377621 is a wasteful number, since it uses less digits than its factorization.

72377621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080330.

The product of its digits is 24696, while the sum is 35.

The square root of 72377621 is about 8507.5038054649. The cubic root of 72377621 is about 416.7427961872.

The spelling of 72377621 in words is "seventy-two million, three hundred seventy-seven thousand, six hundred twenty-one".