73072657 has 4 divisors (see below), whose sum is σ = 83511616. Its totient is φ = 62633700.

The previous prime is 73072631. The next prime is 73072661. The reversal of 73072657 is 75627037.

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-73072657 is a prime.

It is a super-2 number, since 2×73072657² = 10679226402079298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73072607) 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, 5219469 + ... + 5219482.

It is an arithmetic number, because the mean of its divisors is an integer number (20877904).

Almost surely, 2^73072657 is an apocalyptic number.

It is an amenable number.

73072657 is a deficient number, since it is larger than the sum of its proper divisors (10438959).

73072657 is a wasteful number, since it uses less digits than its factorization.

73072657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10438958.

The product of its (nonzero) digits is 61740, while the sum is 37.

The square root of 73072657 is about 8548.2546171719. The cubic root of 73072657 is about 418.0725303960.

The spelling of 73072657 in words is "seventy-three million, seventy-two thousand, six hundred fifty-seven".