420261664 has 12 divisors (see below), whose sum is σ = 827390214. Its totient is φ = 210130816.

The previous prime is 420261631. The next prime is 420261683. The reversal of 420261664 is 466162024.

It can be written as a sum of positive squares in only one way, i.e., 420250000 + 11664 = 20500^2 + 108^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6566557 + ... + 6566620.

Almost surely, 2^420261664 is an apocalyptic number.

It is an amenable number.

420261664 is a deficient number, since it is larger than the sum of its proper divisors (407128550).

420261664 is a wasteful number, since it uses less digits than its factorization.

420261664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13133187 (or 13133179 counting only the distinct ones).

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

The square root of 420261664 is about 20500.2844858309. The cubic root of 420261664 is about 749.0427277299.

The spelling of 420261664 in words is "four hundred twenty million, two hundred sixty-one thousand, six hundred sixty-four".