25047721 has 8 divisors (see below), whose sum is σ = 26019584. Its totient is φ = 24086160.

The previous prime is 25047709. The next prime is 25047769. The reversal of 25047721 is 12774052.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25047721 - 2¹³ = 25039529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25047721.

It is not an unprimeable number, because it can be changed into a prime (25047221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2575 + ... + 7531.

It is an arithmetic number, because the mean of its divisors is an integer number (3252448).

Almost surely, 2^25047721 is an apocalyptic number.

It is an amenable number.

25047721 is a deficient number, since it is larger than the sum of its proper divisors (971863).

25047721 is a wasteful number, since it uses less digits than its factorization.

25047721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5151.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 25047721 is about 5004.7698248771. The cubic root of 25047721 is about 292.5877049678.

The spelling of 25047721 in words is "twenty-five million, forty-seven thousand, seven hundred twenty-one".