24778987 has 2 divisors, whose sum is σ = 24778988. Its totient is φ = 24778986.

The previous prime is 24778973. The next prime is 24779009. The reversal of 24778987 is 78987742.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 24778987 - 2¹⁵ = 24746219 is a prime.

It is a super-2 number, since 2×24778987² = 1227996393492338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (24778927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12389493 + 12389494.

It is an arithmetic number, because the mean of its divisors is an integer number (12389494).

Almost surely, 2^24778987 is an apocalyptic number.

24778987 is a deficient number, since it is larger than the sum of its proper divisors (1).

24778987 is an equidigital number, since it uses as much as digits as its factorization.

24778987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1580544, while the sum is 52.

The square root of 24778987 is about 4977.8496361381. The cubic root of 24778987 is about 291.5375608554.

The spelling of 24778987 in words is "twenty-four million, seven hundred seventy-eight thousand, nine hundred eighty-seven".