402661264 has 10 divisors (see below), whose sum is σ = 780156230. Its totient is φ = 201330624.

The previous prime is 402661261. The next prime is 402661277. The reversal of 402661264 is 462166204.

It can be written as a sum of positive squares in only one way, i.e., 395691664 + 6969600 = 19892^2 + 2640^2 .

It is not an unprimeable number, because it can be changed into a prime (402661261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12583149 + ... + 12583180.

It is an arithmetic number, because the mean of its divisors is an integer number (78015623).

Almost surely, 2^402661264 is an apocalyptic number.

It is an amenable number.

402661264 is a deficient number, since it is larger than the sum of its proper divisors (377494966).

402661264 is a wasteful number, since it uses less digits than its factorization.

402661264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25166337 (or 25166331 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 402661264 is about 20066.4213052552. The cubic root of 402661264 is about 738.4367193092.

The spelling of 402661264 in words is "four hundred two million, six hundred sixty-one thousand, two hundred sixty-four".