642330549 has 72 divisors (see below), whose sum is σ = 1139903232. Its totient is φ = 341288640.

The previous prime is 642330487. The next prime is 642330553. The reversal of 642330549 is 945033246.

642330549 is a `hidden beast` number, since 64 + 23 + 30 + 549 = 666.

It is not a de Polignac number, because 642330549 - 2¹⁷ = 642199477 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642330589) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1387092 + ... + 1387554.

Almost surely, 2^642330549 is an apocalyptic number.

It is an amenable number.

642330549 is a deficient number, since it is larger than the sum of its proper divisors (497572683).

642330549 is a wasteful number, since it uses less digits than its factorization.

642330549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575 (or 553 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 642330549 is about 25344.2409434570. The cubic root of 642330549 is about 862.8186537763.

The spelling of 642330549 in words is "six hundred forty-two million, three hundred thirty thousand, five hundred forty-nine".