27780428 has 24 divisors (see below), whose sum is σ = 52510752. Its totient is φ = 12783744.

The previous prime is 27780419. The next prime is 27780457. The reversal of 27780428 is 82408772.

It is a junction number, because it is equal to n+sod(n) for n = 27780391 and 27780400.

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, 24776 + ... + 25872.

It is an arithmetic number, because the mean of its divisors is an integer number (2187948).

Almost surely, 2^27780428 is an apocalyptic number.

It is an amenable number.

27780428 is a deficient number, since it is larger than the sum of its proper divisors (24730324).

27780428 is a wasteful number, since it uses less digits than its factorization.

27780428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601 (or 1599 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 27780428 is about 5270.7141831065. The cubic root of 27780428 is about 302.8630633791.

The spelling of 27780428 in words is "twenty-seven million, seven hundred eighty thousand, four hundred twenty-eight".