25429988 has 18 divisors (see below), whose sum is σ = 45158274. Its totient is φ = 12530304.

The previous prime is 25429981. The next prime is 25429991. The reversal of 25429988 is 88992452.

It can be written as a sum of positive squares in 3 ways, for example, as 5161984 + 20268004 = 2272^2 + 4502^2 .

It is not an unprimeable number, because it can be changed into a prime (25429981) 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, 20720 + ... + 21912.

It is an arithmetic number, because the mean of its divisors is an integer number (2508793).

Almost surely, 2^25429988 is an apocalyptic number.

It is an amenable number.

25429988 is a deficient number, since it is larger than the sum of its proper divisors (19728286).

25429988 is a wasteful number, since it uses less digits than its factorization.

25429988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343 (or 1268 counting only the distinct ones).

The product of its digits is 414720, while the sum is 47.

The square root of 25429988 is about 5042.8154834378. The cubic root of 25429988 is about 294.0686436351.

The spelling of 25429988 in words is "twenty-five million, four hundred twenty-nine thousand, nine hundred eighty-eight".