18990278376 has 16 divisors (see below), whose sum is σ = 47475696000. Its totient is φ = 6330092784.

The previous prime is 18990278357. The next prime is 18990278387. The reversal of 18990278376 is 67387209981.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 395630776 + ... + 395630823.

It is an arithmetic number, because the mean of its divisors is an integer number (2967231000).

Almost surely, 2^18990278376 is an apocalyptic number.

It is an amenable number.

18990278376 is an abundant number, since it is smaller than the sum of its proper divisors (28485417624).

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

18990278376 is a wasteful number, since it uses less digits than its factorization.

18990278376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791261608 (or 791261604 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 60.

It can be divided in two parts, 189902 and 78376, that added together give a triangular number (268278 = T₇₃₂).

The spelling of 18990278376 in words is "eighteen billion, nine hundred ninety million, two hundred seventy-eight thousand, three hundred seventy-six".