642557775 has 48 divisors (see below), whose sum is σ = 1080375296. Its totient is φ = 336942720.

The previous prime is 642557761. The next prime is 642557813. The reversal of 642557775 is 577755246.

It is not a de Polignac number, because 642557775 - 2⁸ = 642557519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1722489 + ... + 1722861.

Almost surely, 2^642557775 is an apocalyptic number.

642557775 is a deficient number, since it is larger than the sum of its proper divisors (437817521).

642557775 is a wasteful number, since it uses less digits than its factorization.

642557775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712 (or 707 counting only the distinct ones).

The product of its digits is 2058000, while the sum is 48.

The square root of 642557775 is about 25348.7233406339. The cubic root of 642557775 is about 862.9203831834.

The spelling of 642557775 in words is "six hundred forty-two million, five hundred fifty-seven thousand, seven hundred seventy-five".