402644287920 has 80 divisors (see below), whose sum is σ = 1426511197440. Its totient is φ = 92032979712.

The previous prime is 402644287919. The next prime is 402644287957. The reversal of 402644287920 is 29782446204.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 402644287920.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119832930 + ... + 119836289.

It is an arithmetic number, because the mean of its divisors is an integer number (17831389968).

Almost surely, 2^402644287920 is an apocalyptic number.

402644287920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402644287920 is an abundant number, since it is smaller than the sum of its proper divisors (1023866909520).

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

402644287920 is a wasteful number, since it uses less digits than its factorization.

402644287920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239669242 (or 239669236 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 48.

The spelling of 402644287920 in words is "four hundred two billion, six hundred forty-four million, two hundred eighty-seven thousand, nine hundred twenty".