27728630442 has 12 divisors (see below), whose sum is σ = 60078699330. Its totient is φ = 9242876808.

The previous prime is 27728630441. The next prime is 27728630483. The reversal of 27728630442 is 24403682772.

27728630442 is a `hidden beast` number, since 2 + 7 + 7 + 2 + 8 + 630 + 4 + 4 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 22524306561 + 5204323881 = 150081^2 + 72141^2 .

It is not an unprimeable number, because it can be changed into a prime (27728630441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 770239717 + ... + 770239752.

Almost surely, 2^27728630442 is an apocalyptic number.

27728630442 is an abundant number, since it is smaller than the sum of its proper divisors (32350068888).

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

27728630442 is a wasteful number, since it uses less digits than its factorization.

27728630442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540479477 (or 1540479474 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 45.

The spelling of 27728630442 in words is "twenty-seven billion, seven hundred twenty-eight million, six hundred thirty thousand, four hundred forty-two".