18897476640 has 96 divisors (see below), whose sum is σ = 68030928000. Its totient is φ = 4319422464.

The previous prime is 18897476623. The next prime is 18897476671. The reversal of 18897476640 is 4667479881.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×18897476640² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

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, 2808765 + ... + 2815484.

It is an arithmetic number, because the mean of its divisors is an integer number (708655500).

Almost surely, 2^18897476640 is an apocalyptic number.

18897476640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18897476640 is an abundant number, since it is smaller than the sum of its proper divisors (49133451360).

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

18897476640 is a wasteful number, since it uses less digits than its factorization.

18897476640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5624274 (or 5624266 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 60.

The spelling of 18897476640 in words is "eighteen billion, eight hundred ninety-seven million, four hundred seventy-six thousand, six hundred forty".