25781032 has 8 divisors (see below), whose sum is σ = 48339450. Its totient is φ = 12890512.

The previous prime is 25781011. The next prime is 25781033. The reversal of 25781032 is 23018752.

It can be written as a sum of positive squares in only one way, i.e., 19660356 + 6120676 = 4434^2 + 2474^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×25781032² = 1329323221970048, which contains 22 as substring.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (25781033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1611307 + ... + 1611322.

Almost surely, 2^25781032 is an apocalyptic number.

It is an amenable number.

25781032 is a deficient number, since it is larger than the sum of its proper divisors (22558418).

25781032 is a wasteful number, since it uses less digits than its factorization.

25781032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3222635 (or 3222631 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 25781032 is about 5077.5025356961. The cubic root of 25781032 is about 295.4156049579.

Adding to 25781032 its reverse (23018752), we get a palindrome (48799784).

The spelling of 25781032 in words is "twenty-five million, seven hundred eighty-one thousand, thirty-two".