6642236428 has 6 divisors (see below), whose sum is σ = 11623913756. Its totient is φ = 3321118212.

The previous prime is 6642236407. The next prime is 6642236431. The reversal of 6642236428 is 8246322466.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830279550 + ... + 830279557.

Almost surely, 2^6642236428 is an apocalyptic number.

It is an amenable number.

6642236428 is a deficient number, since it is larger than the sum of its proper divisors (4981677328).

6642236428 is a wasteful number, since it uses less digits than its factorization.

6642236428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660559111 (or 1660559109 counting only the distinct ones).

The product of its digits is 663552, while the sum is 43.

The square root of 6642236428 is about 81499.9167361538. The cubic root of 6642236428 is about 1879.7702703294.

The spelling of 6642236428 in words is "six billion, six hundred forty-two million, two hundred thirty-six thousand, four hundred twenty-eight".