151621890 has 64 divisors (see below), whose sum is σ = 418279680. Its totient is φ = 34456320.

The previous prime is 151621823. The next prime is 151621891. The reversal of 151621890 is 98126151.

It is not an unprimeable number, because it can be changed into a prime (151621891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36016 + ... + 40004.

It is an arithmetic number, because the mean of its divisors is an integer number (6535620).

Almost surely, 2^151621890 is an apocalyptic number.

151621890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 151621890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209139840).

151621890 is an abundant number, since it is smaller than the sum of its proper divisors (266657790).

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

151621890 is a wasteful number, since it uses less digits than its factorization.

151621890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4187.

The product of its (nonzero) digits is 4320, while the sum is 33.

The square root of 151621890 is about 12313.4840723493. The cubic root of 151621890 is about 533.2374406590.

The spelling of 151621890 in words is "one hundred fifty-one million, six hundred twenty-one thousand, eight hundred ninety".