25045781 has 16 divisors (see below), whose sum is σ = 28272000. Its totient is φ = 22068288.

The previous prime is 25045771. The next prime is 25045829. The reversal of 25045781 is 18754052.

It is a cyclic number.

It is not a de Polignac number, because 25045781 - 2⁶ = 25045717 is a prime.

It is a super-2 number, since 2×25045781² = 1254582291799922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25045721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15395 + ... + 16943.

It is an arithmetic number, because the mean of its divisors is an integer number (1767000).

Almost surely, 2^25045781 is an apocalyptic number.

It is an amenable number.

25045781 is a deficient number, since it is larger than the sum of its proper divisors (3226219).

25045781 is a wasteful number, since it uses less digits than its factorization.

25045781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 25045781 is about 5004.5760060169. The cubic root of 25045781 is about 292.5801509232.

The spelling of 25045781 in words is "twenty-five million, forty-five thousand, seven hundred eighty-one".