661727404 has 48 divisors (see below), whose sum is σ = 1271108608. Its totient is φ = 299593728.

The previous prime is 661727401. The next prime is 661727447. The reversal of 661727404 is 404727166.

It is not an unprimeable number, because it can be changed into a prime (661727401) 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, 640072 + ... + 641104.

Almost surely, 2^661727404 is an apocalyptic number.

It is an amenable number.

661727404 is a deficient number, since it is larger than the sum of its proper divisors (609381204).

661727404 is a wasteful number, since it uses less digits than its factorization.

661727404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274 (or 1272 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 661727404 is about 25724.0627428873. The cubic root of 661727404 is about 871.4176929728.

The spelling of 661727404 in words is "six hundred sixty-one million, seven hundred twenty-seven thousand, four hundred four".