155372640 has 96 divisors (see below), whose sum is σ = 495059040. Its totient is φ = 40955904.

The previous prime is 155372629. The next prime is 155372641. The reversal of 155372640 is 46273551.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155372641) 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, 40902 + ... + 44538.

It is an arithmetic number, because the mean of its divisors is an integer number (5156865).

Almost surely, 2^155372640 is an apocalyptic number.

155372640 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 155372640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247529520).

155372640 is an abundant number, since it is smaller than the sum of its proper divisors (339686400).

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

155372640 is a wasteful number, since it uses less digits than its factorization.

155372640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3744 (or 3736 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 155372640 is about 12464.8561965231. The cubic root of 155372640 is about 537.5986651398.

The spelling of 155372640 in words is "one hundred fifty-five million, three hundred seventy-two thousand, six hundred forty".