66907239 has 16 divisors (see below), whose sum is σ = 103683840. Its totient is φ = 37584000.

The previous prime is 66907237. The next prime is 66907241. The reversal of 66907239 is 93270966.

It is an interprime number because it is at equal distance from previous prime (66907237) and next prime (66907241).

It is not a de Polignac number, because 66907239 - 2¹ = 66907237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66907239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66907237) 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, 25762 + ... + 28239.

It is an arithmetic number, because the mean of its divisors is an integer number (6480240).

Almost surely, 2^66907239 is an apocalyptic number.

66907239 is a deficient number, since it is larger than the sum of its proper divisors (36776601).

66907239 is a wasteful number, since it uses less digits than its factorization.

66907239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54070.

The product of its (nonzero) digits is 122472, while the sum is 42.

The square root of 66907239 is about 8179.6845293691. The cubic root of 66907239 is about 405.9672840406.

The spelling of 66907239 in words is "sixty-six million, nine hundred seven thousand, two hundred thirty-nine".