25401616 has 20 divisors (see below), whose sum is σ = 49367500. Its totient is φ = 12661632.

The previous prime is 25401611. The next prime is 25401631. The reversal of 25401616 is 61610452.

It can be written as a sum of positive squares in 2 ways, for example, as 18662400 + 6739216 = 4320^2 + 2596^2 .

It is a super-2 number, since 2×25401616² = 1290484190822912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25401611) 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, 3310 + ... + 7858.

It is an arithmetic number, because the mean of its divisors is an integer number (2468375).

Almost surely, 2^25401616 is an apocalyptic number.

It is an amenable number.

25401616 is a deficient number, since it is larger than the sum of its proper divisors (23965884).

25401616 is a wasteful number, since it uses less digits than its factorization.

25401616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4906 (or 4900 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 25401616 is about 5040.0015873013. The cubic root of 25401616 is about 293.9592397254.

It can be divided in two parts, 254016 and 16, that multiplied together give a square (4064256 = 2016²).

The spelling of 25401616 in words is "twenty-five million, four hundred one thousand, six hundred sixteen".