25631378 has 4 divisors (see below), whose sum is σ = 38447070. Its totient is φ = 12815688.

The previous prime is 25631351. The next prime is 25631387. The reversal of 25631378 is 87313652.

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

It can be written as a sum of positive squares in only one way, i.e., 16589329 + 9042049 = 4073^2 + 3007^2 .

It is a super-5 number, since 5×25631378⁵ (a number of 38 digits) contains 55555 as substring.

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 as a sum of consecutive naturals, namely, 6407843 + ... + 6407846.

Almost surely, 2^25631378 is an apocalyptic number.

25631378 is a deficient number, since it is larger than the sum of its proper divisors (12815692).

25631378 is a wasteful number, since it uses less digits than its factorization.

25631378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12815691.

The product of its digits is 30240, while the sum is 35.

The square root of 25631378 is about 5062.7441175710. The cubic root of 25631378 is about 294.8428848319.

The spelling of 25631378 in words is "twenty-five million, six hundred thirty-one thousand, three hundred seventy-eight".