25142778 has 32 divisors (see below), whose sum is σ = 56073600. Its totient is φ = 8350848.

The previous prime is 25142771. The next prime is 25142783. The reversal of 25142778 is 87724152.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (25142771) 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, 18403 + ... + 19721.

It is an arithmetic number, because the mean of its divisors is an integer number (1752300).

Almost surely, 2^25142778 is an apocalyptic number.

25142778 is an abundant number, since it is smaller than the sum of its proper divisors (30930822).

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

25142778 is a wasteful number, since it uses less digits than its factorization.

25142778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683 (or 1677 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 25142778 is about 5014.2574724479. The cubic root of 25142778 is about 292.9573646840.

The spelling of 25142778 in words is "twenty-five million, one hundred forty-two thousand, seven hundred seventy-eight".