402581660 has 36 divisors (see below), whose sum is σ = 915464088. Its totient is φ = 148644288.

The previous prime is 402581659. The next prime is 402581681. The reversal of 402581660 is 66185204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56174 + ... + 62933.

It is an arithmetic number, because the mean of its divisors is an integer number (25429558).

Almost surely, 2^402581660 is an apocalyptic number.

It is an amenable number.

402581660 is an abundant number, since it is smaller than the sum of its proper divisors (512882428).

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

402581660 is a wasteful number, since it uses less digits than its factorization.

402581660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119142 (or 119127 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 402581660 is about 20064.4376945879. The cubic root of 402581660 is about 738.3880544255.

The spelling of 402581660 in words is "four hundred two million, five hundred eighty-one thousand, six hundred sixty".