25721416 has 32 divisors (see below), whose sum is σ = 55298880. Its totient is φ = 10987200.

The previous prime is 25721369. The next prime is 25721417. The reversal of 25721416 is 61412752.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (25721417) 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, 23031 + ... + 24121.

It is an arithmetic number, because the mean of its divisors is an integer number (1728090).

Almost surely, 2^25721416 is an apocalyptic number.

It is an amenable number.

25721416 is an abundant number, since it is smaller than the sum of its proper divisors (29577464).

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

25721416 is a wasteful number, since it uses less digits than its factorization.

25721416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1525 (or 1521 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 25721416 is about 5071.6285352932. The cubic root of 25721416 is about 295.1877230911.

The spelling of 25721416 in words is "twenty-five million, seven hundred twenty-one thousand, four hundred sixteen".