409620864 has 32 divisors (see below), whose sum is σ = 1088056440. Its totient is φ = 136540160.

The previous prime is 409620859. The next prime is 409620877. The reversal of 409620864 is 468026904.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532977 + ... + 533744.

Almost surely, 2^409620864 is an apocalyptic number.

It is an amenable number.

409620864 is an abundant number, since it is smaller than the sum of its proper divisors (678435576).

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

409620864 is a wasteful number, since it uses less digits than its factorization.

409620864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066738 (or 1066726 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 409620864 is about 20239.0924697725. The cubic root of 409620864 is about 742.6668228136. Note that the first 3 decimals are identical.

The spelling of 409620864 in words is "four hundred nine million, six hundred twenty thousand, eight hundred sixty-four".