28429925 has 12 divisors (see below), whose sum is σ = 35579940. Its totient is φ = 22533120.

The previous prime is 28429903. The next prime is 28429931. The reversal of 28429925 is 52992482.

It can be written as a sum of positive squares in 6 ways, for example, as 31684 + 28398241 = 178^2 + 5329^2 .

It is not a de Polignac number, because 28429925 - 2⁶ = 28429861 is a prime.

It is a Curzon number.

It is a congruent 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, 2492 + ... + 7941.

It is an arithmetic number, because the mean of its divisors is an integer number (2964995).

Almost surely, 2^28429925 is an apocalyptic number.

28429925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28429925 is a deficient number, since it is larger than the sum of its proper divisors (7150015).

28429925 is a wasteful number, since it uses less digits than its factorization.

28429925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10552 (or 10547 counting only the distinct ones).

The product of its digits is 103680, while the sum is 41.

The square root of 28429925 is about 5331.9719616667. The cubic root of 28429925 is about 305.2051830862.

The spelling of 28429925 in words is "twenty-eight million, four hundred twenty-nine thousand, nine hundred twenty-five".