155150640 has 240 divisors, whose sum is σ = 565463808. Its totient is φ = 39460608.

The previous prime is 155150591. The next prime is 155150647. The reversal of 155150640 is 46051551.

It is a happy number.

155150640 is a `hidden beast` number, since 1 + 5 + 5 + 15 + 0 + 640 = 666.

155150640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (155150647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 446947 + ... + 447293.

Almost surely, 2^155150640 is an apocalyptic number.

155150640 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 155150640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (282731904).

155150640 is an abundant number, since it is smaller than the sum of its proper divisors (410313168).

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

155150640 is a wasteful number, since it uses less digits than its factorization.

155150640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 155150640 is about 12455.9479767700. The cubic root of 155150640 is about 537.3424986515.

The spelling of 155150640 in words is "one hundred fifty-five million, one hundred fifty thousand, six hundred forty".