661402308 has 48 divisors (see below), whose sum is σ = 1765527680. Its totient is φ = 188780544.

The previous prime is 661402297. The next prime is 661402309. The reversal of 661402308 is 803204166.

It is not an unprimeable number, because it can be changed into a prime (661402309) 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, 93438 + ... + 100266.

Almost surely, 2^661402308 is an apocalyptic number.

It is an amenable number.

661402308 is an abundant number, since it is smaller than the sum of its proper divisors (1104125372).

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

661402308 is a wasteful number, since it uses less digits than its factorization.

661402308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7996 (or 7994 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 661402308 is about 25717.7430580524. The cubic root of 661402308 is about 871.2749651114.

The spelling of 661402308 in words is "six hundred sixty-one million, four hundred two thousand, three hundred eight".