642311092 has 12 divisors (see below), whose sum is σ = 1125123300. Its totient is φ = 320847296.

The previous prime is 642311069. The next prime is 642311101. The reversal of 642311092 is 290113246.

It can be written as a sum of positive squares in 2 ways, for example, as 619213456 + 23097636 = 24884^2 + 4806^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 642311092.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72343 + ... + 80734.

It is an arithmetic number, because the mean of its divisors is an integer number (93760275).

Almost surely, 2^642311092 is an apocalyptic number.

It is an amenable number.

642311092 is a deficient number, since it is larger than the sum of its proper divisors (482812208).

642311092 is a wasteful number, since it uses less digits than its factorization.

642311092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154130 (or 154128 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 642311092 is about 25343.8570860870. The cubic root of 642311092 is about 862.8099417343.

The spelling of 642311092 in words is "six hundred forty-two million, three hundred eleven thousand, ninety-two".