72698657 has 4 divisors (see below), whose sum is σ = 72724656. Its totient is φ = 72672660.

The previous prime is 72698623. The next prime is 72698683. The reversal of 72698657 is 75689627.

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 72698657 - 2⁸ = 72698401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72698557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8219 + ... + 14592.

It is an arithmetic number, because the mean of its divisors is an integer number (18181164).

Almost surely, 2^72698657 is an apocalyptic number.

It is an amenable number.

72698657 is a deficient number, since it is larger than the sum of its proper divisors (25999).

72698657 is a wasteful number, since it uses less digits than its factorization.

72698657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25998.

The product of its digits is 1270080, while the sum is 50.

The square root of 72698657 is about 8526.3507434306. The cubic root of 72698657 is about 417.3580513526.

The spelling of 72698657 in words is "seventy-two million, six hundred ninety-eight thousand, six hundred fifty-seven".