155681380 has 24 divisors (see below), whose sum is σ = 337478400. Its totient is φ = 60263520.

The previous prime is 155681369. The next prime is 155681389. The reversal of 155681380 is 83186551.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (155681389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124930 + ... + 126169.

It is an arithmetic number, because the mean of its divisors is an integer number (14061600).

Almost surely, 2^155681380 is an apocalyptic number.

155681380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155681380 is an abundant number, since it is smaller than the sum of its proper divisors (181797020).

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

155681380 is a wasteful number, since it uses less digits than its factorization.

155681380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251139 (or 251137 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 155681380 is about 12477.2344692243. The cubic root of 155681380 is about 537.9545158546.

The spelling of 155681380 in words is "one hundred fifty-five million, six hundred eighty-one thousand, three hundred eighty".