157642645 has 8 divisors (see below), whose sum is σ = 189433656. Its totient is φ = 125939136.

The previous prime is 157642627. The next prime is 157642691. The reversal of 157642645 is 546246751.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 81848209 + 75794436 = 9047^2 + 8706^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 157642645 - 2⁵ = 157642613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 157642598 and 157642607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17842 + ... + 25171.

It is an arithmetic number, because the mean of its divisors is an integer number (23679207).

Almost surely, 2^157642645 is an apocalyptic number.

It is an amenable number.

157642645 is a deficient number, since it is larger than the sum of its proper divisors (31791011).

157642645 is an equidigital number, since it uses as much as digits as its factorization.

157642645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43751.

The product of its digits is 201600, while the sum is 40.

The square root of 157642645 is about 12555.5822246521. The cubic root of 157642645 is about 540.2041352128.

The spelling of 157642645 in words is "one hundred fifty-seven million, six hundred forty-two thousand, six hundred forty-five".