642620404 has 12 divisors (see below), whose sum is σ = 1127829024. Its totient is φ = 320383544.

The previous prime is 642620401. The next prime is 642620431. The reversal of 642620404 is 404026246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642620401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230104 + ... + 232879.

It is an arithmetic number, because the mean of its divisors is an integer number (93985752).

Almost surely, 2^642620404 is an apocalyptic number.

It is an amenable number.

642620404 is a deficient number, since it is larger than the sum of its proper divisors (485208620).

642620404 is a wasteful number, since it uses less digits than its factorization.

642620404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463334 (or 463332 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 642620404 is about 25349.9586587434. The cubic root of 642620404 is about 862.9484180605.

The spelling of 642620404 in words is "six hundred forty-two million, six hundred twenty thousand, four hundred four".