78260287 has 4 divisors (see below), whose sum is σ = 89440336. Its totient is φ = 67080240.

The previous prime is 78260269. The next prime is 78260309. The reversal of 78260287 is 78206287.

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 78260287 - 2⁷ = 78260159 is a prime.

It is a super-2 number, since 2×78260287² = 12249345042644738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78260257) 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, 5590014 + ... + 5590027.

It is an arithmetic number, because the mean of its divisors is an integer number (22360084).

Almost surely, 2^78260287 is an apocalyptic number.

78260287 is a deficient number, since it is larger than the sum of its proper divisors (11180049).

78260287 is a wasteful number, since it uses less digits than its factorization.

78260287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11180048.

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 78260287 is about 8846.4844429864. The cubic root of 78260287 is about 427.7406043871.

The spelling of 78260287 in words is "seventy-eight million, two hundred sixty thousand, two hundred eighty-seven".