28725945 has 16 divisors (see below), whose sum is σ = 46055040. Its totient is φ = 15289344.

The previous prime is 28725943. The next prime is 28725959. The reversal of 28725945 is 54952782.

It is not a de Polignac number, because 28725945 - 2¹ = 28725943 is a prime.

It is a super-2 number, since 2×28725945² = 1650359832286050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28725897 and 28725906.

It is not an unprimeable number, because it can be changed into a prime (28725943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6996 + ... + 10314.

It is an arithmetic number, because the mean of its divisors is an integer number (2878440).

Almost surely, 2^28725945 is an apocalyptic number.

It is an amenable number.

28725945 is a deficient number, since it is larger than the sum of its proper divisors (17329095).

28725945 is a wasteful number, since it uses less digits than its factorization.

28725945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3904.

The product of its digits is 201600, while the sum is 42.

The square root of 28725945 is about 5359.6590376628. The cubic root of 28725945 is about 306.2608203868.

The spelling of 28725945 in words is "twenty-eight million, seven hundred twenty-five thousand, nine hundred forty-five".