28777625 has 8 divisors (see below), whose sum is σ = 35914632. Its totient is φ = 23022000.

The previous prime is 28777603. The next prime is 28777631. The reversal of 28777625 is 52677782.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5583769 + 23193856 = 2363^2 + 4816^2 .

It is not a de Polignac number, because 28777625 - 2⁶ = 28777561 is a prime.

It is a Duffinian number.

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, 114986 + ... + 115235.

It is an arithmetic number, because the mean of its divisors is an integer number (4489329).

Almost surely, 2^28777625 is an apocalyptic number.

28777625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28777625 is a deficient number, since it is larger than the sum of its proper divisors (7137007).

28777625 is an equidigital number, since it uses as much as digits as its factorization.

28777625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230236 (or 230226 counting only the distinct ones).

The product of its digits is 329280, while the sum is 44.

The square root of 28777625 is about 5364.4780734010. The cubic root of 28777625 is about 306.4443719583. Note that the first 3 decimals are identical.

The spelling of 28777625 in words is "twenty-eight million, seven hundred seventy-seven thousand, six hundred twenty-five".