72040657 has 8 divisors (see below), whose sum is σ = 77656320. Its totient is φ = 66435600.

The previous prime is 72040637. The next prime is 72040663. The reversal of 72040657 is 75604027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72040657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72040637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16782 + ... + 20632.

It is an arithmetic number, because the mean of its divisors is an integer number (9707040).

Almost surely, 2^72040657 is an apocalyptic number.

It is an amenable number.

72040657 is a deficient number, since it is larger than the sum of its proper divisors (5615663).

72040657 is a wasteful number, since it uses less digits than its factorization.

72040657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5303.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 72040657 is about 8487.6767728278. The cubic root of 72040657 is about 416.0950554017.

The spelling of 72040657 in words is "seventy-two million, forty thousand, six hundred fifty-seven".