402661660 has 24 divisors (see below), whose sum is σ = 895330800. Its totient is φ = 151590144.

The previous prime is 402661619. The next prime is 402661663. The reversal of 402661660 is 66166204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402661663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591810 + ... + 592489.

It is an arithmetic number, because the mean of its divisors is an integer number (37305450).

Almost surely, 2^402661660 is an apocalyptic number.

It is an amenable number.

402661660 is an abundant number, since it is smaller than the sum of its proper divisors (492669140).

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

402661660 is a wasteful number, since it uses less digits than its factorization.

402661660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184325 (or 1184323 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 402661660 is about 20066.4311724831. The cubic root of 402661660 is about 738.4369613827.

The spelling of 402661660 in words is "four hundred two million, six hundred sixty-one thousand, six hundred sixty".