25781070 has 64 divisors (see below), whose sum is σ = 71124480. Its totient is φ = 5858688.

The previous prime is 25781069. The next prime is 25781083. The reversal of 25781070 is 7018752.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61321 + ... + 61739.

It is an arithmetic number, because the mean of its divisors is an integer number (1111320).

Almost surely, 2^25781070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25781070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35562240).

25781070 is an abundant number, since it is smaller than the sum of its proper divisors (45343410).

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

25781070 is a wasteful number, since it uses less digits than its factorization.

25781070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 25781070 is about 5077.5062776918. The cubic root of 25781070 is about 295.4157501007.

The spelling of 25781070 in words is "twenty-five million, seven hundred eighty-one thousand, seventy".