24494281978 has 4 divisors (see below), whose sum is σ = 36741422970. Its totient is φ = 12247140988.

The previous prime is 24494281969. The next prime is 24494281979. The reversal of 24494281978 is 87918249442.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87918249442 = 2 ⋅43959124721.

It can be written as a sum of positive squares in only one way, i.e., 23730478209 + 763803769 = 154047^2 + 27637^2 .

It is not an unprimeable number, because it can be changed into a prime (24494281979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6123570493 + ... + 6123570496.

Almost surely, 2^24494281978 is an apocalyptic number.

24494281978 is a deficient number, since it is larger than the sum of its proper divisors (12247140992).

24494281978 is a wasteful number, since it uses less digits than its factorization.

24494281978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12247140991.

The product of its digits is 9289728, while the sum is 58.

The spelling of 24494281978 in words is "twenty-four billion, four hundred ninety-four million, two hundred eighty-one thousand, nine hundred seventy-eight".