25471640 has 32 divisors (see below), whose sum is σ = 57760560. Its totient is φ = 10108800.

The previous prime is 25471637. The next prime is 25471643. The reversal of 25471640 is 4617452.

It is an interprime number because it is at equal distance from previous prime (25471637) and next prime (25471643).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25471643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2810 + ... + 7670.

Almost surely, 2^25471640 is an apocalyptic number.

25471640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25471640 is an abundant number, since it is smaller than the sum of its proper divisors (32288920).

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

25471640 is a wasteful number, since it uses less digits than its factorization.

25471640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5003 (or 4999 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 25471640 is about 5046.9436295643. The cubic root of 25471640 is about 294.2291085934.

The spelling of 25471640 in words is "twenty-five million, four hundred seventy-one thousand, six hundred forty".