25672051840 has 64 divisors (see below), whose sum is σ = 61636007160. Its totient is φ = 10224689152.

The previous prime is 25672051829. The next prime is 25672051871. The reversal of 25672051840 is 4815027652.

It can be written as a sum of positive squares in 4 ways, for example, as 12087683136 + 13584368704 = 109944^2 + 116552^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 25672051793 and 25672051802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63042 + ... + 235198.

Almost surely, 2^25672051840 is an apocalyptic number.

25672051840 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 25672051840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30818003580).

25672051840 is an abundant number, since it is smaller than the sum of its proper divisors (35963955320).

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

25672051840 is a wasteful number, since it uses less digits than its factorization.

25672051840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172409 (or 172397 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 25672051840 in words is "twenty-five billion, six hundred seventy-two million, fifty-one thousand, eight hundred forty".