1264344644420 has 96 divisors (see below), whose sum is σ = 3119603518080. Its totient is φ = 424354959360.

The previous prime is 1264344644401. The next prime is 1264344644447. The reversal of 1264344644420 is 244464434621.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56510996 + ... + 56533364.

It is an arithmetic number, because the mean of its divisors is an integer number (32495869980).

Almost surely, 2^{1264344644420} is an apocalyptic number.

1264344644420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1264344644420 is an abundant number, since it is smaller than the sum of its proper divisors (1855258873660).

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

1264344644420 is a wasteful number, since it uses less digits than its factorization.

1264344644420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42165 (or 42163 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 44.

The spelling of 1264344644420 in words is "one trillion, two hundred sixty-four billion, three hundred forty-four million, six hundred forty-four thousand, four hundred twenty".