731666530 has 24 divisors (see below), whose sum is σ = 1532021148. Its totient is φ = 250856928.

The previous prime is 731666521. The next prime is 731666539. The reversal of 731666530 is 35666137.

It is an interprime number because it is at equal distance from previous prime (731666521) and next prime (731666539).

It can be written as a sum of positive squares in 2 ways, for example, as 730458729 + 1207801 = 27027^2 + 1099^2 .

It is a super-2 number, since 2×731666530² = 1070671822244481800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 731666530.

It is not an unprimeable number, because it can be changed into a prime (731666539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 746109 + ... + 747088.

Almost surely, 2^731666530 is an apocalyptic number.

731666530 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

731666530 is an abundant number, since it is smaller than the sum of its proper divisors (800354618).

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

731666530 is a wasteful number, since it uses less digits than its factorization.

731666530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493218 (or 1493211 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 37.

The square root of 731666530 is about 27049.3351119764. The cubic root of 731666530 is about 901.0960022169.

The spelling of 731666530 in words is "seven hundred thirty-one million, six hundred sixty-six thousand, five hundred thirty".