25642740 has 24 divisors (see below), whose sum is σ = 71799840. Its totient is φ = 6838048.

The previous prime is 25642717. The next prime is 25642741. The reversal of 25642740 is 4724652.

It is a super-2 number, since 2×25642740² = 1315100229415200, which contains 22 as substring.

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 = 25642698 and 25642707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25642741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213630 + ... + 213749.

It is an arithmetic number, because the mean of its divisors is an integer number (2991660).

Almost surely, 2^25642740 is an apocalyptic number.

25642740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25642740 is an abundant number, since it is smaller than the sum of its proper divisors (46157100).

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

25642740 is a wasteful number, since it uses less digits than its factorization.

25642740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427391 (or 427389 counting only the distinct ones).

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

The square root of 25642740 is about 5063.8661119741. The cubic root of 25642740 is about 294.8864448514.

The spelling of 25642740 in words is "twenty-five million, six hundred forty-two thousand, seven hundred forty".