25722840 has 128 divisors (see below), whose sum is σ = 90720000. Its totient is φ = 5752320.

The previous prime is 25722833. The next prime is 25722859. The reversal of 25722840 is 4822752.

25722840 = 243² + 244² + ... + 450².

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

It is a junction number, because it is equal to n+sod(n) for n = 25722798 and 25722807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16411 + ... + 17909.

It is an arithmetic number, because the mean of its divisors is an integer number (708750).

Almost surely, 2^25722840 is an apocalyptic number.

25722840 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 25722840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45360000).

25722840 is an abundant number, since it is smaller than the sum of its proper divisors (64997160).

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

25722840 is a wasteful number, since it uses less digits than its factorization.

25722840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1537 (or 1533 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 25722840 is about 5071.7689221809. The cubic root of 25722840 is about 295.1931704268.

It can be divided in two parts, 25722 and 840, that added together give a palindrome (26562).

The spelling of 25722840 in words is "twenty-five million, seven hundred twenty-two thousand, eight hundred forty".