25440740 has 24 divisors (see below), whose sum is σ = 57535800. Its totient is φ = 9393408.

The previous prime is 25440731. The next prime is 25440749. The reversal of 25440740 is 4704452.

It is an interprime number because it is at equal distance from previous prime (25440731) and next prime (25440749).

It can be written as a sum of positive squares in 4 ways, for example, as 2611456 + 22829284 = 1616^2 + 4778^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (25440749) 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, 48665 + ... + 49184.

It is an arithmetic number, because the mean of its divisors is an integer number (2397325).

Almost surely, 2^25440740 is an apocalyptic number.

25440740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25440740 is an abundant number, since it is smaller than the sum of its proper divisors (32095060).

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

25440740 is a wasteful number, since it uses less digits than its factorization.

25440740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97871 (or 97869 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 26.

The square root of 25440740 is about 5043.8814419056. The cubic root of 25440740 is about 294.1100826447.

The spelling of 25440740 in words is "twenty-five million, four hundred forty thousand, seven hundred forty".