28478372 has 12 divisors (see below), whose sum is σ = 53670876. Its totient is φ = 13143840.

The previous prime is 28478339. The next prime is 28478413. The reversal of 28478372 is 27387482.

It can be written as a sum of positive squares in 2 ways, for example, as 3936256 + 24542116 = 1984^2 + 4954^2 .

It is a super-2 number, since 2×28478372² = 1622035343540768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273779 + ... + 273882.

It is an arithmetic number, because the mean of its divisors is an integer number (4472573).

Almost surely, 2^28478372 is an apocalyptic number.

It is an amenable number.

28478372 is a deficient number, since it is larger than the sum of its proper divisors (25192504).

28478372 is a wasteful number, since it uses less digits than its factorization.

28478372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547678 (or 547676 counting only the distinct ones).

The product of its digits is 150528, while the sum is 41.

The square root of 28478372 is about 5336.5130937720. The cubic root of 28478372 is about 305.3784498632.

The spelling of 28478372 in words is "twenty-eight million, four hundred seventy-eight thousand, three hundred seventy-two".