25380778 has 4 divisors (see below), whose sum is σ = 38071170. Its totient is φ = 12690388.

The previous prime is 25380769. The next prime is 25380787. The reversal of 25380778 is 87708352.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (25380769) and next prime (25380787).

It can be written as a sum of positive squares in only one way, i.e., 25371369 + 9409 = 5037^2 + 97^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 25380778.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6345193 + ... + 6345196.

Almost surely, 2^25380778 is an apocalyptic number.

25380778 is a deficient number, since it is larger than the sum of its proper divisors (12690392).

25380778 is a wasteful number, since it uses less digits than its factorization.

25380778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12690391.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 25380778 is about 5037.9339019086. The cubic root of 25380778 is about 293.8788354130.

The spelling of 25380778 in words is "twenty-five million, three hundred eighty thousand, seven hundred seventy-eight".