157288821 has 8 divisors (see below), whose sum is σ = 220756320. Its totient is φ = 99340272.

The previous prime is 157288759. The next prime is 157288841. The reversal of 157288821 is 128882751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 157288821 - 2⁶ = 157288757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157288841) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1379670 + ... + 1379783.

It is an arithmetic number, because the mean of its divisors is an integer number (27594540).

Almost surely, 2^157288821 is an apocalyptic number.

It is an amenable number.

157288821 is a deficient number, since it is larger than the sum of its proper divisors (63467499).

157288821 is a wasteful number, since it uses less digits than its factorization.

157288821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2759475.

The product of its digits is 71680, while the sum is 42.

The square root of 157288821 is about 12541.4840030995. The cubic root of 157288821 is about 539.7996753515.

The spelling of 157288821 in words is "one hundred fifty-seven million, two hundred eighty-eight thousand, eight hundred twenty-one".