25138464 has 48 divisors (see below), whose sum is σ = 71068032. Its totient is φ = 7734528.

The previous prime is 25138439. The next prime is 25138481. The reversal of 25138464 is 46483152.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

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, 8824 + ... + 11319.

It is an arithmetic number, because the mean of its divisors is an integer number (1480584).

Almost surely, 2^25138464 is an apocalyptic number.

25138464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25138464 is an abundant number, since it is smaller than the sum of its proper divisors (45929568).

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

25138464 is a wasteful number, since it uses less digits than its factorization.

25138464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20169 (or 20161 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 25138464 is about 5013.8272806310. The cubic root of 25138464 is about 292.9406085090.

The spelling of 25138464 in words is "twenty-five million, one hundred thirty-eight thousand, four hundred sixty-four".