157720550 has 24 divisors (see below), whose sum is σ = 315927696. Its totient is φ = 58235040.

The previous prime is 157720513. The next prime is 157720561. The reversal of 157720550 is 55027751.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120674 + ... + 121973.

It is an arithmetic number, because the mean of its divisors is an integer number (13163654).

Almost surely, 2^157720550 is an apocalyptic number.

157720550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

157720550 is an abundant number, since it is smaller than the sum of its proper divisors (158207146).

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

157720550 is a wasteful number, since it uses less digits than its factorization.

157720550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242672 (or 242667 counting only the distinct ones).

The product of its (nonzero) digits is 12250, while the sum is 32.

The square root of 157720550 is about 12558.6842463691. The cubic root of 157720550 is about 540.2931079069.

The spelling of 157720550 in words is "one hundred fifty-seven million, seven hundred twenty thousand, five hundred fifty".