25642432340 has 48 divisors (see below), whose sum is σ = 62086493952. Its totient is φ = 8713883136.

The previous prime is 25642432337. The next prime is 25642432373. The reversal of 25642432340 is 4323424652.

It is a happy number.

It is a super-2 number, since 2×25642432340² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 25642432340.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 794624 + ... + 826263.

It is an arithmetic number, because the mean of its divisors is an integer number (1293468624).

Almost surely, 2^25642432340 is an apocalyptic number.

25642432340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25642432340 is an abundant number, since it is smaller than the sum of its proper divisors (36444061612).

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

25642432340 is a wasteful number, since it uses less digits than its factorization.

25642432340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621016 (or 1621014 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 35.

Adding to 25642432340 its reverse (4323424652), we get a palindrome (29965856992).

The spelling of 25642432340 in words is "twenty-five billion, six hundred forty-two million, four hundred thirty-two thousand, three hundred forty".