25491730 has 32 divisors (see below), whose sum is σ = 52695360. Its totient is φ = 8781120.

The previous prime is 25491689. The next prime is 25491731. The reversal of 25491730 is 3719452.

It is a junction number, because it is equal to n+sod(n) for n = 25491692 and 25491701.

It is not an unprimeable number, because it can be changed into a prime (25491731) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4009 + ... + 8188.

It is an arithmetic number, because the mean of its divisors is an integer number (1646730).

Almost surely, 2^25491730 is an apocalyptic number.

25491730 is an abundant number, since it is smaller than the sum of its proper divisors (27203630).

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

25491730 is a wasteful number, since it uses less digits than its factorization.

25491730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12234.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 25491730 is about 5048.9335507610. The cubic root of 25491730 is about 294.3064430906.

The spelling of 25491730 in words is "twenty-five million, four hundred ninety-one thousand, seven hundred thirty".