25729979 has 4 divisors (see below), whose sum is σ = 28069080. Its totient is φ = 23390880.

The previous prime is 25729927. The next prime is 25729981. The reversal of 25729979 is 97992752.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25729979 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (25729999) 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, 1169534 + ... + 1169555.

It is an arithmetic number, because the mean of its divisors is an integer number (7017270).

Almost surely, 2^25729979 is an apocalyptic number.

25729979 is a deficient number, since it is larger than the sum of its proper divisors (2339101).

25729979 is a wasteful number, since it uses less digits than its factorization.

25729979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2339100.

The product of its digits is 714420, while the sum is 50.

The square root of 25729979 is about 5072.4726711930. The cubic root of 25729979 is about 295.2204767574.

The spelling of 25729979 in words is "twenty-five million, seven hundred twenty-nine thousand, nine hundred seventy-nine".