28930925 has 6 divisors (see below), whose sum is σ = 35874378. Its totient is φ = 23144720.

The previous prime is 28930921. The next prime is 28930927. The reversal of 28930925 is 52903982.

It can be written as a sum of positive squares in 3 ways, for example, as 2036329 + 26894596 = 1427^2 + 5186^2 .

It is not a de Polignac number, because 28930925 - 2² = 28930921 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28930921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 578594 + ... + 578643.

It is an arithmetic number, because the mean of its divisors is an integer number (5979063).

Almost surely, 2^28930925 is an apocalyptic number.

28930925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28930925 is a deficient number, since it is larger than the sum of its proper divisors (6943453).

28930925 is a wasteful number, since it uses less digits than its factorization.

28930925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157247 (or 1157242 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 28930925 is about 5378.7475307919. The cubic root of 28930925 is about 306.9875572770.

The spelling of 28930925 in words is "twenty-eight million, nine hundred thirty thousand, nine hundred twenty-five".