157321808 has 80 divisors (see below), whose sum is σ = 376047360. Its totient is φ = 62220288.

The previous prime is 157321783. The next prime is 157321823. The reversal of 157321808 is 808123751.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100133 + ... + 101691.

It is an arithmetic number, because the mean of its divisors is an integer number (4700592).

Almost surely, 2^157321808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 157321808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188023680).

157321808 is an abundant number, since it is smaller than the sum of its proper divisors (218725552).

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

157321808 is a wasteful number, since it uses less digits than its factorization.

157321808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644 (or 1638 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 157321808 is about 12542.7990496539. The cubic root of 157321808 is about 539.8374087541.

The spelling of 157321808 in words is "one hundred fifty-seven million, three hundred twenty-one thousand, eight hundred eight".