25275453840 has 400 divisors, whose sum is σ = 108046084608. Its totient is φ = 5332718592.

The previous prime is 25275453839. The next prime is 25275453859. The reversal of 25275453840 is 4835457252.

25275453840 is a `hidden beast` number, since 2 + 5 + 2 + 75 + 4 + 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 79 ways as a sum of consecutive naturals, for example, 568249 + ... + 611111.

Almost surely, 2^25275453840 is an apocalyptic number.

25275453840 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 25275453840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54023042304).

25275453840 is an abundant number, since it is smaller than the sum of its proper divisors (82770630768).

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

25275453840 is a wasteful number, since it uses less digits than its factorization.

25275453840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42908 (or 42893 counting only the distinct ones).

The product of its (nonzero) digits is 1344000, while the sum is 45.

The spelling of 25275453840 in words is "twenty-five billion, two hundred seventy-five million, four hundred fifty-three thousand, eight hundred forty".