72666015 has 36 divisors (see below), whose sum is σ = 121853016. Its totient is φ = 36976800.

The previous prime is 72665987. The next prime is 72666019. The reversal of 72666015 is 51066627.

It is not a de Polignac number, because 72666015 - 2²¹ = 70568863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72666019) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1023430 + ... + 1023500.

It is an arithmetic number, because the mean of its divisors is an integer number (3384806).

Almost surely, 2^72666015 is an apocalyptic number.

72666015 is a deficient number, since it is larger than the sum of its proper divisors (49187001).

72666015 is an equidigital number, since it uses as much as digits as its factorization.

72666015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 72666015 is about 8524.4363450025. The cubic root of 72666015 is about 417.2955768330.

The spelling of 72666015 in words is "seventy-two million, six hundred sixty-six thousand, fifteen".