642136702 has 16 divisors (see below), whose sum is σ = 999447120. Its totient is φ = 309166848.

The previous prime is 642136687. The next prime is 642136757. The reversal of 642136702 is 207631246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37552 + ... + 51907.

It is an arithmetic number, because the mean of its divisors is an integer number (62465445).

Almost surely, 2^642136702 is an apocalyptic number.

642136702 is a deficient number, since it is larger than the sum of its proper divisors (357310418).

642136702 is a wasteful number, since it uses less digits than its factorization.

642136702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89595.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 642136702 is about 25340.4163738483. The cubic root of 642136702 is about 862.7318492301.

Adding to 642136702 its reverse (207631246), we get a palindrome (849767948).

The spelling of 642136702 in words is "six hundred forty-two million, one hundred thirty-six thousand, seven hundred two".