72096557 has 4 divisors (see below), whose sum is σ = 77642460. Its totient is φ = 66550656.

The previous prime is 72096547. The next prime is 72096587. The reversal of 72096557 is 75569027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75569027 = 41 ⋅1843147.

It can be written as a sum of positive squares in 2 ways, for example, as 19838116 + 52258441 = 4454^2 + 7229^2 .

It is a cyclic number.

It is not a de Polignac number, because 72096557 - 2⁸ = 72096301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72096517) 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, 2772932 + ... + 2772957.

It is an arithmetic number, because the mean of its divisors is an integer number (19410615).

Almost surely, 2^72096557 is an apocalyptic number.

It is an amenable number.

72096557 is a deficient number, since it is larger than the sum of its proper divisors (5545903).

72096557 is a wasteful number, since it uses less digits than its factorization.

72096557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5545902.

The product of its (nonzero) digits is 132300, while the sum is 41.

The square root of 72096557 is about 8490.9691437433. The cubic root of 72096557 is about 416.2026506636.

The spelling of 72096557 in words is "seventy-two million, ninety-six thousand, five hundred fifty-seven".