642799692 has 24 divisors (see below), whose sum is σ = 1666518000. Its totient is φ = 214266528.

The previous prime is 642799673. The next prime is 642799693. The reversal of 642799692 is 296997246.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (642799693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2975817 + ... + 2976032.

It is an arithmetic number, because the mean of its divisors is an integer number (69438250).

Almost surely, 2^642799692 is an apocalyptic number.

It is an amenable number.

642799692 is an abundant number, since it is smaller than the sum of its proper divisors (1023718308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642799692 is a wasteful number, since it uses less digits than its factorization.

642799692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5951862 (or 5951854 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 642799692 is about 25353.4946703605. The cubic root of 642799692 is about 863.0286634168.

The spelling of 642799692 in words is "six hundred forty-two million, seven hundred ninety-nine thousand, six hundred ninety-two".