72662921 has 2 divisors, whose sum is σ = 72662922. Its totient is φ = 72662920.

The previous prime is 72662899. The next prime is 72662939. The reversal of 72662921 is 12926627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67980025 + 4682896 = 8245^2 + 2164^2 .

It is a cyclic number.

It is not a de Polignac number, because 72662921 - 2²⁶ = 5554057 is a prime.

It is not a weakly prime, because it can be changed into another prime (72662621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36331460 + 36331461.

It is an arithmetic number, because the mean of its divisors is an integer number (36331461).

Almost surely, 2^72662921 is an apocalyptic number.

It is an amenable number.

72662921 is a deficient number, since it is larger than the sum of its proper divisors (1).

72662921 is an equidigital number, since it uses as much as digits as its factorization.

72662921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 72662921 is about 8524.2548647961. The cubic root of 72662921 is about 417.2896541613.

The spelling of 72662921 in words is "seventy-two million, six hundred sixty-two thousand, nine hundred twenty-one".