157216420 has 12 divisors (see below), whose sum is σ = 330154524. Its totient is φ = 62886560.

The previous prime is 157216417. The next prime is 157216421. The reversal of 157216420 is 24612751.

It can be written as a sum of positive squares in 2 ways, for example, as 21307456 + 135908964 = 4616^2 + 11658^2 .

It is not an unprimeable number, because it can be changed into a prime (157216421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3930391 + ... + 3930430.

It is an arithmetic number, because the mean of its divisors is an integer number (27512877).

Almost surely, 2^157216420 is an apocalyptic number.

157216420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

157216420 is an abundant number, since it is smaller than the sum of its proper divisors (172938104).

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

157216420 is a wasteful number, since it uses less digits than its factorization.

157216420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7860830 (or 7860828 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 157216420 is about 12538.5972102145. The cubic root of 157216420 is about 539.7168382833.

The spelling of 157216420 in words is "one hundred fifty-seven million, two hundred sixteen thousand, four hundred twenty".