25708353840 has 480 divisors, whose sum is σ = 98054349120. Its totient is φ = 5991358464.

The previous prime is 25708353833. The next prime is 25708353851. The reversal of 25708353840 is 4835380752.

25708353840 is a `hidden beast` number, since 2 + 5 + 70 + 8 + 3 + 538 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 14385427 + ... + 14387213.

It is an arithmetic number, because the mean of its divisors is an integer number (204279894).

Almost surely, 2^25708353840 is an apocalyptic number.

25708353840 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 25708353840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49027174560).

25708353840 is an abundant number, since it is smaller than the sum of its proper divisors (72345995280).

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

25708353840 is a wasteful number, since it uses less digits than its factorization.

25708353840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901 (or 1892 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The spelling of 25708353840 in words is "twenty-five billion, seven hundred eight million, three hundred fifty-three thousand, eight hundred forty".