158551920 has 180 divisors, whose sum is σ = 549940248. Its totient is φ = 40934400.

The previous prime is 158551909. The next prime is 158551927. The reversal of 158551920 is 29155851.

It is a happy number.

158551920 is a `hidden beast` number, since 1 + 585 + 51 + 9 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (180).

It is a super-2 number, since 2×158551920² = 50277422671372800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158551927) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1210255 + ... + 1210385.

Almost surely, 2^158551920 is an apocalyptic number.

158551920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 158551920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274970124).

158551920 is an abundant number, since it is smaller than the sum of its proper divisors (391388328).

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

158551920 is a wasteful number, since it uses less digits than its factorization.

158551920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 36.

The square root of 158551920 is about 12591.7401497966. The cubic root of 158551920 is about 541.2407682787.

The spelling of 158551920 in words is "one hundred fifty-eight million, five hundred fifty-one thousand, nine hundred twenty".