25615420 has 24 divisors (see below), whose sum is σ = 56624400. Its totient is φ = 9706752.

The previous prime is 25615409. The next prime is 25615427. The reversal of 25615420 is 2451652.

It is a super-2 number, since 2×25615420² = 1312299483552800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25615427) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 33325 + ... + 34084.

It is an arithmetic number, because the mean of its divisors is an integer number (2359350).

Almost surely, 2^25615420 is an apocalyptic number.

25615420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25615420 is an abundant number, since it is smaller than the sum of its proper divisors (31008980).

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

25615420 is a wasteful number, since it uses less digits than its factorization.

25615420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67437 (or 67435 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 25615420 is about 5061.1678494197. The cubic root of 25615420 is about 294.7816827700.

The spelling of 25615420 in words is "twenty-five million, six hundred fifteen thousand, four hundred twenty".