18928419640 has 32 divisors (see below), whose sum is σ = 45865018080. Its totient is φ = 6988954752.

The previous prime is 18928419637. The next prime is 18928419691. The reversal of 18928419640 is 4691482981.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18199884 + ... + 18200923.

It is an arithmetic number, because the mean of its divisors is an integer number (1433281815).

Almost surely, 2^18928419640 is an apocalyptic number.

18928419640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18928419640 is an abundant number, since it is smaller than the sum of its proper divisors (26936598440).

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

18928419640 is a wasteful number, since it uses less digits than its factorization.

18928419640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36400831 (or 36400827 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 52.

The spelling of 18928419640 in words is "eighteen billion, nine hundred twenty-eight million, four hundred nineteen thousand, six hundred forty".