25172023440 has 40 divisors (see below), whose sum is σ = 78033273408. Its totient is φ = 6712539520.

The previous prime is 25172023439. The next prime is 25172023477. The reversal of 25172023440 is 4432027152.

It is a tau number, because it is divible by the number of its divisors (40).

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 = 25172023398 and 25172023407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52441476 + ... + 52441955.

Almost surely, 2^25172023440 is an apocalyptic number.

25172023440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25172023440 is an abundant number, since it is smaller than the sum of its proper divisors (52861249968).

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

25172023440 is a wasteful number, since it uses less digits than its factorization.

25172023440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104883447 (or 104883441 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 30.

The spelling of 25172023440 in words is "twenty-five billion, one hundred seventy-two million, twenty-three thousand, four hundred forty".