25221790 has 32 divisors (see below), whose sum is σ = 50873184. Its totient is φ = 8922240.

The previous prime is 25221787. The next prime is 25221839. The reversal of 25221790 is 9712252.

It is a super-2 number, since 2×25221790² = 1272277381608200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 972 + ... + 7168.

It is an arithmetic number, because the mean of its divisors is an integer number (1589787).

Almost surely, 2^25221790 is an apocalyptic number.

25221790 is an abundant number, since it is smaller than the sum of its proper divisors (25651394).

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

25221790 is a wasteful number, since it uses less digits than its factorization.

25221790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6252.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 25221790 is about 5022.1300261941. The cubic root of 25221790 is about 293.2639198129.

The spelling of 25221790 in words is "twenty-five million, two hundred twenty-one thousand, seven hundred ninety".