25264721 has 4 divisors (see below), whose sum is σ = 26079744. Its totient is φ = 24449700.

The previous prime is 25264691. The next prime is 25264739. The reversal of 25264721 is 12746252.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25264721 - 2¹⁰ = 25263697 is a prime.

It is a super-2 number, since 2×25264721² = 1276612254415682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25264751) 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, 407465 + ... + 407526.

It is an arithmetic number, because the mean of its divisors is an integer number (6519936).

Almost surely, 2^25264721 is an apocalyptic number.

It is an amenable number.

25264721 is a deficient number, since it is larger than the sum of its proper divisors (815023).

25264721 is an equidigital number, since it uses as much as digits as its factorization.

25264721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815022.

The product of its digits is 6720, while the sum is 29.

The square root of 25264721 is about 5026.4023913730. The cubic root of 25264721 is about 293.4302175091.

The spelling of 25264721 in words is "twenty-five million, two hundred sixty-four thousand, seven hundred twenty-one".