78448987 has 4 divisors (see below), whose sum is σ = 78659680. Its totient is φ = 78238296.

The previous prime is 78448963. The next prime is 78449009. The reversal of 78448987 is 78984487.

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

It is a cyclic number.

It is not a de Polignac number, because 78448987 - 2⁷ = 78448859 is a prime.

It is a super-2 number, since 2×78448987² = 12308487122652338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78448907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104787 + ... + 105532.

It is an arithmetic number, because the mean of its divisors is an integer number (19664920).

Almost surely, 2^78448987 is an apocalyptic number.

78448987 is a deficient number, since it is larger than the sum of its proper divisors (210693).

78448987 is a wasteful number, since it uses less digits than its factorization.

78448987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210692.

The product of its digits is 3612672, while the sum is 55.

The square root of 78448987 is about 8857.1432753456. The cubic root of 78448987 is about 428.0841156334.

The spelling of 78448987 in words is "seventy-eight million, four hundred forty-eight thousand, nine hundred eighty-seven".