25047640 has 16 divisors (see below), whose sum is σ = 56357280. Its totient is φ = 10019040.

The previous prime is 25047611. The next prime is 25047653. The reversal of 25047640 is 4674052.

It is a super-4 number, since 4×25047640⁴ (a number of 31 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25047599 and 25047608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313056 + ... + 313135.

It is an arithmetic number, because the mean of its divisors is an integer number (3522330).

Almost surely, 2^25047640 is an apocalyptic number.

25047640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25047640 is an abundant number, since it is smaller than the sum of its proper divisors (31309640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25047640 is a wasteful number, since it uses less digits than its factorization.

25047640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626202 (or 626198 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 25047640 is about 5004.7617325903. The cubic root of 25047640 is about 292.5873895748.

The spelling of 25047640 in words is "twenty-five million, forty-seven thousand, six hundred forty".