28307425 has 12 divisors (see below), whose sum is σ = 35958636. Its totient is φ = 22092800.

The previous prime is 28307381. The next prime is 28307441. The reversal of 28307425 is 52470382.

It can be written as a sum of positive squares in 6 ways, for example, as 14676561 + 13630864 = 3831^2 + 3692^2 .

It is not a de Polignac number, because 28307425 - 2¹³ = 28299233 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12784 + ... + 14833.

It is an arithmetic number, because the mean of its divisors is an integer number (2996553).

Almost surely, 2^28307425 is an apocalyptic number.

28307425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28307425 is a deficient number, since it is larger than the sum of its proper divisors (7651211).

28307425 is a wasteful number, since it uses less digits than its factorization.

28307425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27668 (or 27663 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 28307425 is about 5320.4722534752. The cubic root of 28307425 is about 304.7661918594.

The spelling of 28307425 in words is "twenty-eight million, three hundred seven thousand, four hundred twenty-five".