25533840 has 40 divisors (see below), whose sum is σ = 79155648. Its totient is φ = 6808960.

The previous prime is 25533839. The next prime is 25533869. The reversal of 25533840 is 4833552.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

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 = 25533798 and 25533807.

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 7 ways as a sum of consecutive naturals, for example, 52956 + ... + 53435.

Almost surely, 2^25533840 is an apocalyptic number.

25533840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25533840 is an abundant number, since it is smaller than the sum of its proper divisors (53621808).

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

25533840 is a wasteful number, since it uses less digits than its factorization.

25533840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106407 (or 106401 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 25533840 is about 5053.1020175730. The cubic root of 25533840 is about 294.4684096892.

The spelling of 25533840 in words is "twenty-five million, five hundred thirty-three thousand, eight hundred forty".