25244135420 has 48 divisors (see below), whose sum is σ = 62063644608. Its totient is φ = 8444029440.

The previous prime is 25244135407. The next prime is 25244135437. The reversal of 25244135420 is 2453144252.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2193227 + ... + 2204706.

It is an arithmetic number, because the mean of its divisors is an integer number (1292992596).

Almost surely, 2^25244135420 is an apocalyptic number.

25244135420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25244135420 is an abundant number, since it is smaller than the sum of its proper divisors (36819509188).

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

25244135420 is a wasteful number, since it uses less digits than its factorization.

25244135420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4397990 (or 4397988 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 32.

Adding to 25244135420 its reverse (2453144252), we get a palindrome (27697279672).

The spelling of 25244135420 in words is "twenty-five billion, two hundred forty-four million, one hundred thirty-five thousand, four hundred twenty".