405640885290 has 64 divisors (see below), whose sum is σ = 1043321769216. Its totient is φ = 100671386112.

The previous prime is 405640885283. The next prime is 405640885291. The reversal of 405640885290 is 92588046504.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (405640885291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7918867 + ... + 7969926.

It is an arithmetic number, because the mean of its divisors is an integer number (16301902644).

Almost surely, 2^405640885290 is an apocalyptic number.

405640885290 is an abundant number, since it is smaller than the sum of its proper divisors (637680883926).

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

405640885290 is a wasteful number, since it uses less digits than its factorization.

405640885290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15888863.

The product of its (nonzero) digits is 2764800, while the sum is 51.

The spelling of 405640885290 in words is "four hundred five billion, six hundred forty million, eight hundred eighty-five thousand, two hundred ninety".