157620644 has 6 divisors (see below), whose sum is σ = 275836134. Its totient is φ = 78810320.

The previous prime is 157620613. The next prime is 157620667. The reversal of 157620644 is 446026751.

It can be written as a sum of positive squares in only one way, i.e., 91393600 + 66227044 = 9560^2 + 8138^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19702577 + ... + 19702584.

It is an arithmetic number, because the mean of its divisors is an integer number (45972689).

Almost surely, 2^157620644 is an apocalyptic number.

It is an amenable number.

157620644 is a deficient number, since it is larger than the sum of its proper divisors (118215490).

157620644 is a wasteful number, since it uses less digits than its factorization.

157620644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39405165 (or 39405163 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 157620644 is about 12554.7060499241. The cubic root of 157620644 is about 540.1790032990.

The spelling of 157620644 in words is "one hundred fifty-seven million, six hundred twenty thousand, six hundred forty-four".