66886731 has 24 divisors (see below), whose sum is σ = 100442160. Its totient is φ = 42840000.

The previous prime is 66886723. The next prime is 66886741. The reversal of 66886731 is 13768866.

It is not a de Polignac number, because 66886731 - 2³ = 66886723 is a prime.

It is a super-2 number, since 2×66886731² = 8947669567732722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66886741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65001 + ... + 66021.

It is an arithmetic number, because the mean of its divisors is an integer number (4185090).

Almost surely, 2^66886731 is an apocalyptic number.

66886731 is a deficient number, since it is larger than the sum of its proper divisors (33555429).

66886731 is a wasteful number, since it uses less digits than its factorization.

66886731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307 (or 1304 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 66886731 is about 8178.4308397149. The cubic root of 66886731 is about 405.9258015944.

The spelling of 66886731 in words is "sixty-six million, eight hundred eighty-six thousand, seven hundred thirty-one".