72571818 has 16 divisors (see below), whose sum is σ = 158338656. Its totient is φ = 21991440.

The previous prime is 72571813. The next prime is 72571823. The reversal of 72571818 is 81817527.

It is an interprime number because it is at equal distance from previous prime (72571813) and next prime (72571823).

It is not an unprimeable number, because it can be changed into a prime (72571813) 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, 549721 + ... + 549852.

It is an arithmetic number, because the mean of its divisors is an integer number (9896166).

Almost surely, 2^72571818 is an apocalyptic number.

72571818 is an abundant number, since it is smaller than the sum of its proper divisors (85766838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72571818 is a wasteful number, since it uses less digits than its factorization.

72571818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099589.

The product of its digits is 31360, while the sum is 39.

The square root of 72571818 is about 8518.9094372461. The cubic root of 72571818 is about 417.1151853589.

The spelling of 72571818 in words is "seventy-two million, five hundred seventy-one thousand, eight hundred eighteen".