405578670640 has 120 divisors (see below), whose sum is σ = 1116218338704. Its totient is φ = 136138252800.

The previous prime is 405578670619. The next prime is 405578670701. The reversal of 405578670640 is 46076875504.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1485646 + ... + 1737325.

Almost surely, 2^405578670640 is an apocalyptic number.

405578670640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

405578670640 is an abundant number, since it is smaller than the sum of its proper divisors (710639668064).

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

405578670640 is a wasteful number, since it uses less digits than its factorization.

405578670640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223019 (or 3223002 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 52.

The spelling of 405578670640 in words is "four hundred five billion, five hundred seventy-eight million, six hundred seventy thousand, six hundred forty".