155761920 has 144 divisors (see below), whose sum is σ = 552861120. Its totient is φ = 41527296.

The previous prime is 155761913. The next prime is 155761927. The reversal of 155761920 is 29167551.

155761920 is a `hidden beast` number, since 15 + 5 + 7 + 619 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (155761913) and next prime (155761927).

It is a tau number, because it is divible by the number of its divisors (144).

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 (155761927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32307 + ... + 36813.

Almost surely, 2^155761920 is an apocalyptic number.

155761920 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 155761920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276430560).

155761920 is an abundant number, since it is smaller than the sum of its proper divisors (397099200).

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

155761920 is an equidigital number, since it uses as much as digits as its factorization.

155761920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4537 (or 4517 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 36.

The square root of 155761920 is about 12480.4615299275. The cubic root of 155761920 is about 538.0472680884.

The spelling of 155761920 in words is "one hundred fifty-five million, seven hundred sixty-one thousand, nine hundred twenty".