25249978 has 8 divisors (see below), whose sum is σ = 40788468. Its totient is φ = 11653824.

The previous prime is 25249969. The next prime is 25249979. The reversal of 25249978 is 87994252.

It can be written as a sum of positive squares in 2 ways, for example, as 24235929 + 1014049 = 4923^2 + 1007^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×25249978² = 1275122778000968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25249979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485551 + ... + 485602.

Almost surely, 2^25249978 is an apocalyptic number.

25249978 is a deficient number, since it is larger than the sum of its proper divisors (15538490).

25249978 is a wasteful number, since it uses less digits than its factorization.

25249978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971168.

The product of its digits is 362880, while the sum is 46.

The square root of 25249978 is about 5024.9356214781. The cubic root of 25249978 is about 293.3731302180.

The spelling of 25249978 in words is "twenty-five million, two hundred forty-nine thousand, nine hundred seventy-eight".