642897237 has 16 divisors (see below), whose sum is σ = 885479040. Its totient is φ = 414591552.

The previous prime is 642897221. The next prime is 642897253. The reversal of 642897237 is 732798246.

642897237 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (642897221) and next prime (642897253).

It is not a de Polignac number, because 642897237 - 2⁴ = 642897221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642897287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2464 + ... + 35942.

It is an arithmetic number, because the mean of its divisors is an integer number (55342440).

Almost surely, 2^642897237 is an apocalyptic number.

It is an amenable number.

642897237 is a deficient number, since it is larger than the sum of its proper divisors (242581803).

642897237 is a wasteful number, since it uses less digits than its factorization.

642897237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33692.

The product of its digits is 1016064, while the sum is 48.

The square root of 642897237 is about 25355.4182966876. The cubic root of 642897237 is about 863.0723161410.

The spelling of 642897237 in words is "six hundred forty-two million, eight hundred ninety-seven thousand, two hundred thirty-seven".