642838476 has 288 divisors, whose sum is σ = 2027773440. Its totient is φ = 154441728.

The previous prime is 642838463. The next prime is 642838489. The reversal of 642838476 is 674838246.

It is an interprime number because it is at equal distance from previous prime (642838463) and next prime (642838489).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 14949711 + ... + 14949753.

It is an arithmetic number, because the mean of its divisors is an integer number (7040880).

Almost surely, 2^642838476 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 642838476, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1013886720).

642838476 is an abundant number, since it is smaller than the sum of its proper divisors (1384934964).

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

642838476 is a wasteful number, since it uses less digits than its factorization.

642838476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 120 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 48.

The square root of 642838476 is about 25354.2595237960. The cubic root of 642838476 is about 863.0460203171.

The spelling of 642838476 in words is "six hundred forty-two million, eight hundred thirty-eight thousand, four hundred seventy-six".