402610664 has 8 divisors (see below), whose sum is σ = 754895010. Its totient is φ = 201305328.

The previous prime is 402610651. The next prime is 402610679. The reversal of 402610664 is 466016204.

It can be written as a sum of positive squares in only one way, i.e., 317196100 + 85414564 = 17810^2 + 9242^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25163159 + ... + 25163174.

Almost surely, 2^402610664 is an apocalyptic number.

It is an amenable number.

402610664 is a deficient number, since it is larger than the sum of its proper divisors (352284346).

402610664 is a wasteful number, since it uses less digits than its factorization.

402610664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50326339 (or 50326335 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 402610664 is about 20065.1604528845. The cubic root of 402610664 is about 738.4057863915.

Adding to 402610664 its reverse (466016204), we get a palindrome (868626868).

The spelling of 402610664 in words is "four hundred two million, six hundred ten thousand, six hundred sixty-four".