72622257 has 4 divisors (see below), whose sum is σ = 96829680. Its totient is φ = 48414836.

The previous prime is 72622241. The next prime is 72622271. The reversal of 72622257 is 75222627.

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 72622257 - 2⁴ = 72622241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72622457) 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, 12103707 + ... + 12103712.

It is an arithmetic number, because the mean of its divisors is an integer number (24207420).

Almost surely, 2^72622257 is an apocalyptic number.

It is an amenable number.

72622257 is a deficient number, since it is larger than the sum of its proper divisors (24207423).

72622257 is a wasteful number, since it uses less digits than its factorization.

72622257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24207422.

The product of its digits is 23520, while the sum is 33.

The square root of 72622257 is about 8521.8693371818. The cubic root of 72622257 is about 417.2117977039.

The spelling of 72622257 in words is "seventy-two million, six hundred twenty-two thousand, two hundred fifty-seven".