25716720 has 80 divisors (see below), whose sum is σ = 80744832. Its totient is φ = 6769920.

The previous prime is 25716689. The next prime is 25716749. The reversal of 25716720 is 2761752.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×25716720² = 1322699375116800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 19275 + ... + 20565.

Almost surely, 2^25716720 is an apocalyptic number.

25716720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25716720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40372416).

25716720 is an abundant number, since it is smaller than the sum of its proper divisors (55028112).

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

25716720 is a wasteful number, since it uses less digits than its factorization.

25716720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390 (or 1384 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 25716720 is about 5071.1655464991. The cubic root of 25716720 is about 295.1697576998.

The spelling of 25716720 in words is "twenty-five million, seven hundred sixteen thousand, seven hundred twenty".