642888846 has 16 divisors (see below), whose sum is σ = 1428642000. Its totient is φ = 214296264.

The previous prime is 642888823. The next prime is 642888853. The reversal of 642888846 is 648888246.

It is a super-2 number, since 2×642888846² = 826612136622423432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 11905349 = 642888846 / (6 + 4 + 2 + 8 + 8 + 8 + 8 + 4 + 6).

It is a junction number, because it is equal to n+sod(n) for n = 642888792 and 642888801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5952621 + ... + 5952728.

It is an arithmetic number, because the mean of its divisors is an integer number (89290125).

Almost surely, 2^642888846 is an apocalyptic number.

642888846 is an abundant number, since it is smaller than the sum of its proper divisors (785753154).

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

642888846 is a wasteful number, since it uses less digits than its factorization.

642888846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11905360 (or 11905354 counting only the distinct ones).

The product of its digits is 4718592, while the sum is 54.

The square root of 642888846 is about 25355.2528285561. The cubic root of 642888846 is about 863.0685612271.

The spelling of 642888846 in words is "six hundred forty-two million, eight hundred eighty-eight thousand, eight hundred forty-six".