642877870 has 16 divisors (see below), whose sum is σ = 1158156000. Its totient is φ = 256934304.

The previous prime is 642877867. The next prime is 642877871. The reversal of 642877870 is 78778246.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642877871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14370 + ... + 38629.

It is an arithmetic number, because the mean of its divisors is an integer number (72384750).

Almost surely, 2^642877870 is an apocalyptic number.

642877870 is a deficient number, since it is larger than the sum of its proper divisors (515278130).

642877870 is a wasteful number, since it uses less digits than its factorization.

642877870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54219.

The product of its (nonzero) digits is 1053696, while the sum is 49.

The square root of 642877870 is about 25355.0363833302. The cubic root of 642877870 is about 863.0636494945.

The spelling of 642877870 in words is "six hundred forty-two million, eight hundred seventy-seven thousand, eight hundred seventy".