642984804 has 288 divisors, whose sum is σ = 2148636672. Its totient is φ = 164656800.

The previous prime is 642984799. The next prime is 642984809. The reversal of 642984804 is 408489246.

It is an interprime number because it is at equal distance from previous prime (642984799) and next prime (642984809).

It is a self number, because there is not a number n which added to its sum of digits gives 642984804.

It is not an unprimeable number, because it can be changed into a prime (642984809) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9056089 + ... + 9056159.

It is an arithmetic number, because the mean of its divisors is an integer number (7460544).

Almost surely, 2^642984804 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642984804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1074318336).

642984804 is an abundant number, since it is smaller than the sum of its proper divisors (1505651868).

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

642984804 is a wasteful number, since it uses less digits than its factorization.

642984804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The square root of 642984804 is about 25357.1450285713. The cubic root of 642984804 is about 863.1114998125. Note that the first 3 decimals are identical.

The spelling of 642984804 in words is "six hundred forty-two million, nine hundred eighty-four thousand, eight hundred four".