405881064 has 32 divisors (see below), whose sum is σ = 1127448000. Its totient is φ = 135293616.

The previous prime is 405881053. The next prime is 405881093. The reversal of 405881064 is 460188504.

405881064 is a `hidden beast` number, since 4 + 0 + 588 + 10 + 64 = 666.

It is a super-2 number, since 2×405881064² = 329478876227544192, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 939324 + ... + 939755.

It is an arithmetic number, because the mean of its divisors is an integer number (35232750).

Almost surely, 2^405881064 is an apocalyptic number.

It is an amenable number.

405881064 is an abundant number, since it is smaller than the sum of its proper divisors (721566936).

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

405881064 is a wasteful number, since it uses less digits than its factorization.

405881064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879094 (or 1879084 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 405881064 is about 20146.4901161468. The cubic root of 405881064 is about 740.3997499270.

The spelling of 405881064 in words is "four hundred five million, eight hundred eighty-one thousand, sixty-four".