25697977 has 4 divisors (see below), whose sum is σ = 26526976. Its totient is φ = 24868980.

The previous prime is 25697963. The next prime is 25697983. The reversal of 25697977 is 77979652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25697977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25697927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 414453 + ... + 414514.

It is an arithmetic number, because the mean of its divisors is an integer number (6631744).

Almost surely, 2^25697977 is an apocalyptic number.

It is an amenable number.

25697977 is a deficient number, since it is larger than the sum of its proper divisors (828999).

25697977 is an equidigital number, since it uses as much as digits as its factorization.

25697977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828998.

The product of its digits is 1666980, while the sum is 52.

The square root of 25697977 is about 5069.3172124064. The cubic root of 25697977 is about 295.0980311945.

The spelling of 25697977 in words is "twenty-five million, six hundred ninety-seven thousand, nine hundred seventy-seven".