25621470 has 96 divisors (see below), whose sum is σ = 77395968. Its totient is φ = 5759424.

The previous prime is 25621459. The next prime is 25621487. The reversal of 25621470 is 7412652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41907 + ... + 42513.

It is an arithmetic number, because the mean of its divisors is an integer number (806208).

Almost surely, 2^25621470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25621470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38697984).

25621470 is an abundant number, since it is smaller than the sum of its proper divisors (51774498).

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

25621470 is a wasteful number, since it uses less digits than its factorization.

25621470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694 (or 691 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 25621470 is about 5061.7655022729. The cubic root of 25621470 is about 294.8048886982.

It can be divided in two parts, 2562 and 1470, that multiplied together give a triangular number (3766140 = T₂₇₄₄).

The spelling of 25621470 in words is "twenty-five million, six hundred twenty-one thousand, four hundred seventy".