155844864 has 144 divisors (see below), whose sum is σ = 526861440. Its totient is φ = 44513280.

The previous prime is 155844863. The next prime is 155844883. The reversal of 155844864 is 468448551.

It is a happy number.

155844864 is a `hidden beast` number, since 1 + 5 + 584 + 4 + 8 + 64 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (155844863) 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, 46774 + ... + 49994.

It is an arithmetic number, because the mean of its divisors is an integer number (3658760).

Almost surely, 2^155844864 is an apocalyptic number.

155844864 is a gapful number since it is divisible by the number (14) 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 155844864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263430720).

155844864 is an abundant number, since it is smaller than the sum of its proper divisors (371016576).

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

155844864 is an equidigital number, since it uses as much as digits as its factorization.

155844864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3253 (or 3233 counting only the distinct ones).

The product of its digits is 614400, while the sum is 45.

The square root of 155844864 is about 12483.7840417079. The cubic root of 155844864 is about 538.1427554267.

The spelling of 155844864 in words is "one hundred fifty-five million, eight hundred forty-four thousand, eight hundred sixty-four".