264401279920 has 40 divisors (see below), whose sum is σ = 623908107504. Its totient is φ = 104181994752.

The previous prime is 264401279801. The next prime is 264401279921. The reversal of 264401279920 is 29972104462.

264401279920 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (264401279921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24658939 + ... + 24669658.

Almost surely, 2^264401279920 is an apocalyptic number.

264401279920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

264401279920 is an abundant number, since it is smaller than the sum of its proper divisors (359506827584).

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

264401279920 is a wasteful number, since it uses less digits than its factorization.

264401279920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49328677 (or 49328671 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 264401279920 in words is "two hundred sixty-four billion, four hundred one million, two hundred seventy-nine thousand, nine hundred twenty".