157821270 has 32 divisors (see below), whose sum is σ = 380298240. Its totient is φ = 41916000.

The previous prime is 157821241. The next prime is 157821271. The reversal of 157821270 is 72128751.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157821271) 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, 2950 + ... + 18009.

It is an arithmetic number, because the mean of its divisors is an integer number (11884320).

Almost surely, 2^157821270 is an apocalyptic number.

157821270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

157821270 is an abundant number, since it is smaller than the sum of its proper divisors (222476970).

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

157821270 is a wasteful number, since it uses less digits than its factorization.

157821270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21220.

The product of its (nonzero) digits is 7840, while the sum is 33.

The square root of 157821270 is about 12562.6935805981. The cubic root of 157821270 is about 540.4080934349.

The spelling of 157821270 in words is "one hundred fifty-seven million, eight hundred twenty-one thousand, two hundred seventy".