24779987 has 2 divisors, whose sum is σ = 24779988. Its totient is φ = 24779986.

The previous prime is 24779981. The next prime is 24780013. The reversal of 24779987 is 78997742.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 24779987 - 2⁸ = 24779731 is a prime.

It is a super-2 number, since 2×24779987² = 1228095511440338, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (24779981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12389993 + 12389994.

It is an arithmetic number, because the mean of its divisors is an integer number (12389994).

Almost surely, 2^24779987 is an apocalyptic number.

24779987 is a deficient number, since it is larger than the sum of its proper divisors (1).

24779987 is an equidigital number, since it uses as much as digits as its factorization.

24779987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 53.

The square root of 24779987 is about 4977.9500801033. The cubic root of 24779987 is about 291.5414826412.

The spelling of 24779987 in words is "twenty-four million, seven hundred seventy-nine thousand, nine hundred eighty-seven".