25729340 has 96 divisors (see below), whose sum is σ = 67812864. Its totient is φ = 7983360.

The previous prime is 25729339. The next prime is 25729357. The reversal of 25729340 is 4392752.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 25729297 and 25729306.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121835 + ... + 122045.

It is an arithmetic number, because the mean of its divisors is an integer number (706384).

Almost surely, 2^25729340 is an apocalyptic number.

25729340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25729340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33906432).

25729340 is an abundant number, since it is smaller than the sum of its proper divisors (42083524).

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

25729340 is a wasteful number, since it uses less digits than its factorization.

25729340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 25729340 is about 5072.4096837696. The cubic root of 25729340 is about 295.2180328190.

The spelling of 25729340 in words is "twenty-five million, seven hundred twenty-nine thousand, three hundred forty".