157721360 has 20 divisors (see below), whose sum is σ = 366702348. Its totient is φ = 63088512.

The previous prime is 157721357. The next prime is 157721407. The reversal of 157721360 is 63127751.

It can be written as a sum of positive squares in 2 ways, for example, as 18386944 + 139334416 = 4288^2 + 11804^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 985679 + ... + 985838.

Almost surely, 2^157721360 is an apocalyptic number.

157721360 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

157721360 is an abundant number, since it is smaller than the sum of its proper divisors (208980988).

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

157721360 is a wasteful number, since it uses less digits than its factorization.

157721360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1971530 (or 1971524 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 157721360 is about 12558.7164949289. The cubic root of 157721360 is about 540.2940328269.

The spelling of 157721360 in words is "one hundred fifty-seven million, seven hundred twenty-one thousand, three hundred sixty".