151638990 has 16 divisors (see below), whose sum is σ = 363933648. Its totient is φ = 40437056.

The previous prime is 151638979. The next prime is 151639003. The reversal of 151638990 is 99836151.

151638990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 2527287 + ... + 2527346.

It is an arithmetic number, because the mean of its divisors is an integer number (22745853).

Almost surely, 2^151638990 is an apocalyptic number.

151638990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

151638990 is an abundant number, since it is smaller than the sum of its proper divisors (212294658).

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

151638990 is a wasteful number, since it uses less digits than its factorization.

151638990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5054643.

The product of its (nonzero) digits is 58320, while the sum is 42.

The square root of 151638990 is about 12314.1784135199. The cubic root of 151638990 is about 533.2574861758.

It can be divided in two parts, 151638 and 990, that added together give a triangular number (152628 = T₅₅₂).

The spelling of 151638990 in words is "one hundred fifty-one million, six hundred thirty-eight thousand, nine hundred ninety".