25478247236 has 24 divisors (see below), whose sum is σ = 48057062424. Its totient is φ = 11749305600.

The previous prime is 25478247199. The next prime is 25478247251. The reversal of 25478247236 is 63274287452.

It can be written as a sum of positive squares in 4 ways, for example, as 468722500 + 25009524736 = 21650^2 + 158144^2 .

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, 143315 + ... + 267386.

It is an arithmetic number, because the mean of its divisors is an integer number (2002377601).

Almost surely, 2^25478247236 is an apocalyptic number.

25478247236 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

25478247236 is a deficient number, since it is larger than the sum of its proper divisors (22578815188).

25478247236 is a wasteful number, since it uses less digits than its factorization.

25478247236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411911 (or 411909 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 50.

The spelling of 25478247236 in words is "twenty-five billion, four hundred seventy-eight million, two hundred forty-seven thousand, two hundred thirty-six".