28478655 has 32 divisors (see below), whose sum is σ = 53611200. Its totient is φ = 14294016.

The previous prime is 28478633. The next prime is 28478657. The reversal of 28478655 is 55687482.

It is not a de Polignac number, because 28478655 - 2⁶ = 28478591 is a prime.

It is a super-2 number, since 2×28478655² = 1622067581218050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28478655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28478657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3910 + ... + 8499.

It is an arithmetic number, because the mean of its divisors is an integer number (1675350).

Almost surely, 2^28478655 is an apocalyptic number.

28478655 is a deficient number, since it is larger than the sum of its proper divisors (25132545).

28478655 is a wasteful number, since it uses less digits than its factorization.

28478655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12440 (or 12434 counting only the distinct ones).

The product of its digits is 537600, while the sum is 45.

The square root of 28478655 is about 5336.5396091475. The cubic root of 28478655 is about 305.3794614123.

The spelling of 28478655 in words is "twenty-eight million, four hundred seventy-eight thousand, six hundred fifty-five".