25778506 has 32 divisors (see below), whose sum is σ = 43545600. Its totient is φ = 11363520.

The previous prime is 25778491. The next prime is 25778507. The reversal of 25778506 is 60587752.

It is not an unprimeable number, because it can be changed into a prime (25778507) 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, 134871 + ... + 135061.

It is an arithmetic number, because the mean of its divisors is an integer number (1360800).

Almost surely, 2^25778506 is an apocalyptic number.

25778506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

25778506 is a deficient number, since it is larger than the sum of its proper divisors (17767094).

25778506 is a wasteful number, since it uses less digits than its factorization.

25778506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414.

The product of its (nonzero) digits is 117600, while the sum is 40.

The square root of 25778506 is about 5077.2537852662. The cubic root of 25778506 is about 295.4059564666.

The spelling of 25778506 in words is "twenty-five million, seven hundred seventy-eight thousand, five hundred six".