8657404642 has 4 divisors (see below), whose sum is σ = 12986106966. Its totient is φ = 4328702320.

The previous prime is 8657404607. The next prime is 8657404643. The reversal of 8657404642 is 2464047568.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8161496281 + 495908361 = 90341^2 + 22269^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8657404592 and 8657404601.

It is not an unprimeable number, because it can be changed into a prime (8657404643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2164351159 + ... + 2164351162.

Almost surely, 2^8657404642 is an apocalyptic number.

8657404642 is a deficient number, since it is larger than the sum of its proper divisors (4328702324).

8657404642 is a wasteful number, since it uses less digits than its factorization.

8657404642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4328702323.

The product of its (nonzero) digits is 1290240, while the sum is 46.

The square root of 8657404642 is about 93045.1752752393. The cubic root of 8657404642 is about 2053.3480599652.

The spelling of 8657404642 in words is "eight billion, six hundred fifty-seven million, four hundred four thousand, six hundred forty-two".