642289557 has 32 divisors (see below), whose sum is σ = 1071320320. Its totient is φ = 333227520.

The previous prime is 642289489. The next prime is 642289577. The reversal of 642289557 is 755982246.

It is not a de Polignac number, because 642289557 - 2¹² = 642285461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642289577) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2632 + ... + 35937.

It is an arithmetic number, because the mean of its divisors is an integer number (33478760).

Almost surely, 2^642289557 is an apocalyptic number.

It is an amenable number.

642289557 is a deficient number, since it is larger than the sum of its proper divisors (429030763).

642289557 is a wasteful number, since it uses less digits than its factorization.

642289557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38653.

The product of its digits is 1209600, while the sum is 48.

The square root of 642289557 is about 25343.4322261212. The cubic root of 642289557 is about 862.8002990446.

The spelling of 642289557 in words is "six hundred forty-two million, two hundred eighty-nine thousand, five hundred fifty-seven".