18472252720 has 40 divisors (see below), whose sum is σ = 44333412480. Its totient is φ = 7150548480.

The previous prime is 18472252703. The next prime is 18472252723. The reversal of 18472252720 is 2725227481.

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

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (18472252723) 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, 3721765 + ... + 3726724.

It is an arithmetic number, because the mean of its divisors is an integer number (1108335312).

Almost surely, 2^18472252720 is an apocalyptic number.

18472252720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18472252720 is an abundant number, since it is smaller than the sum of its proper divisors (25861159760).

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

18472252720 is a wasteful number, since it uses less digits than its factorization.

18472252720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7448533 (or 7448527 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 40.

The spelling of 18472252720 in words is "eighteen billion, four hundred seventy-two million, two hundred fifty-two thousand, seven hundred twenty".