155638580 has 12 divisors (see below), whose sum is σ = 326841060. Its totient is φ = 62255424.

The previous prime is 155638579. The next prime is 155638589. The reversal of 155638580 is 85836551.

155638580 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 30780304 + 124858276 = 5548^2 + 11174^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155638589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3890945 + ... + 3890984.

It is an arithmetic number, because the mean of its divisors is an integer number (27236755).

Almost surely, 2^155638580 is an apocalyptic number.

155638580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155638580 is an abundant number, since it is smaller than the sum of its proper divisors (171202480).

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

155638580 is a wasteful number, since it uses less digits than its factorization.

155638580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7781938 (or 7781936 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 41.

The square root of 155638580 is about 12475.5192276714. The cubic root of 155638580 is about 537.9052130980.

The spelling of 155638580 in words is "one hundred fifty-five million, six hundred thirty-eight thousand, five hundred eighty".