28911425 has 6 divisors (see below), whose sum is σ = 35850198. Its totient is φ = 23129120.

The previous prime is 28911403. The next prime is 28911433. The reversal of 28911425 is 52411982.

It can be written as a sum of positive squares in 3 ways, for example, as 85264 + 28826161 = 292^2 + 5369^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28911425 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28911391 and 28911400.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 578204 + ... + 578253.

It is an arithmetic number, because the mean of its divisors is an integer number (5975033).

Almost surely, 2^28911425 is an apocalyptic number.

28911425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28911425 is a deficient number, since it is larger than the sum of its proper divisors (6938773).

28911425 is a wasteful number, since it uses less digits than its factorization.

28911425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156467 (or 1156462 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

The square root of 28911425 is about 5376.9345355881. The cubic root of 28911425 is about 306.9185699354.

The spelling of 28911425 in words is "twenty-eight million, nine hundred eleven thousand, four hundred twenty-five".