72880081 has 4 divisors (see below), whose sum is σ = 73257892. Its totient is φ = 72502272.

The previous prime is 72880079. The next prime is 72880091. The reversal of 72880081 is 18008827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18008827 = 19 ⋅947833.

It can be written as a sum of positive squares in 2 ways, for example, as 16329681 + 56550400 = 4041^2 + 7520^2 .

It is a cyclic number.

It is not a de Polignac number, because 72880081 - 2¹ = 72880079 is a prime.

It is a super-2 number, since 2×72880081² = 10623012413133122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72880091) 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, 188616 + ... + 189001.

It is an arithmetic number, because the mean of its divisors is an integer number (18314473).

Almost surely, 2^72880081 is an apocalyptic number.

It is an amenable number.

72880081 is a deficient number, since it is larger than the sum of its proper divisors (377811).

72880081 is a wasteful number, since it uses less digits than its factorization.

72880081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377810.

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 72880081 is about 8536.9831322312. The cubic root of 72880081 is about 417.7049439017.

The spelling of 72880081 in words is "seventy-two million, eight hundred eighty thousand, eighty-one".