661713400 has 24 divisors (see below), whose sum is σ = 1538484120. Its totient is φ = 264685280.

The previous prime is 661713343. The next prime is 661713443. The reversal of 661713400 is 4317166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1654084 + ... + 1654483.

It is an arithmetic number, because the mean of its divisors is an integer number (64103505).

Almost surely, 2^661713400 is an apocalyptic number.

It is an amenable number.

661713400 is an abundant number, since it is smaller than the sum of its proper divisors (876770720).

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

661713400 is a wasteful number, since it uses less digits than its factorization.

661713400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3308583 (or 3308574 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 661713400 is about 25723.7905449411. The cubic root of 661713400 is about 871.4115457187.

The spelling of 661713400 in words is "six hundred sixty-one million, seven hundred thirteen thousand, four hundred".