72720087 has 16 divisors (see below), whose sum is σ = 111342720. Its totient is φ = 41752800.

The previous prime is 72720071. The next prime is 72720091. The reversal of 72720087 is 78002727.

It is a happy number.

It is not a de Polignac number, because 72720087 - 2⁴ = 72720071 is a prime.

It is a super-2 number, since 2×72720087² = 10576422106575138, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72720097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57364 + ... + 58617.

It is an arithmetic number, because the mean of its divisors is an integer number (6958920).

Almost surely, 2^72720087 is an apocalyptic number.

72720087 is a deficient number, since it is larger than the sum of its proper divisors (38622633).

72720087 is a wasteful number, since it uses less digits than its factorization.

72720087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116014.

The product of its (nonzero) digits is 10976, while the sum is 33.

The square root of 72720087 is about 8527.6073432118. The cubic root of 72720087 is about 417.3990567151.

The spelling of 72720087 in words is "seventy-two million, seven hundred twenty thousand, eighty-seven".