642623490 has 64 divisors (see below), whose sum is σ = 1768965120. Its totient is φ = 165836160.

The previous prime is 642623483. The next prime is 642623497. The reversal of 642623490 is 94326246.

642623490 is a `hidden beast` number, since 642 + 6 + 2 + 3 + 4 + 9 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (642623483) and next prime (642623497).

It is not an unprimeable number, because it can be changed into a prime (642623497) 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 31 ways as a sum of consecutive naturals, for example, 30019 + ... + 46758.

It is an arithmetic number, because the mean of its divisors is an integer number (27640080).

Almost surely, 2^642623490 is an apocalyptic number.

642623490 is an abundant number, since it is smaller than the sum of its proper divisors (1126341630).

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

642623490 is a wasteful number, since it uses less digits than its factorization.

642623490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76824 (or 76818 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 642623490 is about 25350.0195266197. The cubic root of 642623490 is about 862.9497994123.

The spelling of 642623490 in words is "six hundred forty-two million, six hundred twenty-three thousand, four hundred ninety".