25320040 has 16 divisors (see below), whose sum is σ = 56970180. Its totient is φ = 10128000.

The previous prime is 25320013. The next prime is 25320041. The reversal of 25320040 is 4002352.

It can be written as a sum of positive squares in 2 ways, for example, as 24542116 + 777924 = 4954^2 + 882^2 .

It is a super-2 number, since 2×25320040² = 1282208851203200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25319996 and 25320023.

It is not an unprimeable number, because it can be changed into a prime (25320041) 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, 316461 + ... + 316540.

Almost surely, 2^25320040 is an apocalyptic number.

25320040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25320040 is an abundant number, since it is smaller than the sum of its proper divisors (31650140).

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

25320040 is a wasteful number, since it uses less digits than its factorization.

25320040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633012 (or 633008 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 25320040 is about 5031.9022248052. The cubic root of 25320040 is about 293.6442238744.

Adding to 25320040 its reverse (4002352), we get a palindrome (29322392).

The spelling of 25320040 in words is "twenty-five million, three hundred twenty thousand, forty".