25778555 has 16 divisors (see below), whose sum is σ = 34159104. Its totient is φ = 18518880.

The previous prime is 25778551. The next prime is 25778591. The reversal of 25778555 is 55587752.

It is not a de Polignac number, because 25778555 - 2² = 25778551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25778551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1742 + ... + 7388.

It is an arithmetic number, because the mean of its divisors is an integer number (2134944).

Almost surely, 2^25778555 is an apocalyptic number.

25778555 is a deficient number, since it is larger than the sum of its proper divisors (8380549).

25778555 is a wasteful number, since it uses less digits than its factorization.

25778555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5746.

The product of its digits is 490000, while the sum is 44.

The square root of 25778555 is about 5077.2586107072. The cubic root of 25778555 is about 295.4061436365.

The spelling of 25778555 in words is "twenty-five million, seven hundred seventy-eight thousand, five hundred fifty-five".