642451924 has 12 divisors (see below), whose sum is σ = 1124551764. Its totient is φ = 321151424.

The previous prime is 642451907. The next prime is 642451933. The reversal of 642451924 is 429154246.

It can be written as a sum of positive squares in 2 ways, for example, as 542051524 + 100400400 = 23282^2 + 10020^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3744 + ... + 36040.

It is an arithmetic number, because the mean of its divisors is an integer number (93712647).

Almost surely, 2^642451924 is an apocalyptic number.

It is an amenable number.

642451924 is a deficient number, since it is larger than the sum of its proper divisors (482099840).

642451924 is a wasteful number, since it uses less digits than its factorization.

642451924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37274 (or 37272 counting only the distinct ones).

The product of its digits is 69120, while the sum is 37.

The square root of 642451924 is about 25346.6353585639. The cubic root of 642451924 is about 862.8729965228.

The spelling of 642451924 in words is "six hundred forty-two million, four hundred fifty-one thousand, nine hundred twenty-four".