25720546 has 4 divisors (see below), whose sum is σ = 38580822. Its totient is φ = 12860272.

The previous prime is 25720543. The next prime is 25720549. The reversal of 25720546 is 64502752.

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 (25720543) and next prime (25720549).

It can be written as a sum of positive squares in only one way, i.e., 24059025 + 1661521 = 4905^2 + 1289^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (25720543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6430135 + ... + 6430138.

Almost surely, 2^25720546 is an apocalyptic number.

25720546 is a deficient number, since it is larger than the sum of its proper divisors (12860276).

25720546 is a wasteful number, since it uses less digits than its factorization.

25720546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12860275.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 25720546 is about 5071.5427633019. The cubic root of 25720546 is about 295.1843949149.

The spelling of 25720546 in words is "twenty-five million, seven hundred twenty thousand, five hundred forty-six".