642879387 has 24 divisors (see below), whose sum is σ = 936765648. Its totient is φ = 424838400.

The previous prime is 642879353. The next prime is 642879397. The reversal of 642879387 is 783978246.

It is not a de Polignac number, because 642879387 - 2⁶ = 642879323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642879317) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 588712 + ... + 589802.

It is an arithmetic number, because the mean of its divisors is an integer number (39031902).

Almost surely, 2^642879387 is an apocalyptic number.

642879387 is a deficient number, since it is larger than the sum of its proper divisors (293886261).

642879387 is a wasteful number, since it uses less digits than its factorization.

642879387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1611 (or 1608 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The square root of 642879387 is about 25355.0662984738. The cubic root of 642879387 is about 863.0643283515.

The spelling of 642879387 in words is "six hundred forty-two million, eight hundred seventy-nine thousand, three hundred eighty-seven".