25815073 has 4 divisors (see below), whose sum is σ = 26105220. Its totient is φ = 25524928.

The previous prime is 25815001. The next prime is 25815089. The reversal of 25815073 is 37051852.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10188864 + 15626209 = 3192^2 + 3953^2 .

It is a cyclic number.

It is not a de Polignac number, because 25815073 - 2¹³ = 25806881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25815373) 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, 144940 + ... + 145117.

It is an arithmetic number, because the mean of its divisors is an integer number (6526305).

Almost surely, 2^25815073 is an apocalyptic number.

It is an amenable number.

25815073 is a deficient number, since it is larger than the sum of its proper divisors (290147).

25815073 is an equidigital number, since it uses as much as digits as its factorization.

25815073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290146.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 25815073 is about 5080.8535700215. The cubic root of 25815073 is about 295.5455689796.

The spelling of 25815073 in words is "twenty-five million, eight hundred fifteen thousand, seventy-three".