78706287 has 24 divisors (see below), whose sum is σ = 126064848. Its totient is φ = 46915200.

The previous prime is 78706283. The next prime is 78706301. The reversal of 78706287 is 78260787.

It is not a de Polignac number, because 78706287 - 2² = 78706283 is a prime.

It is a super-2 number, since 2×78706287² = 12389359226652738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78706283) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 478 + ... + 12555.

It is an arithmetic number, because the mean of its divisors is an integer number (5252702).

Almost surely, 2^78706287 is an apocalyptic number.

78706287 is a deficient number, since it is larger than the sum of its proper divisors (47358561).

78706287 is a wasteful number, since it uses less digits than its factorization.

78706287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13111 (or 13108 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 45.

The square root of 78706287 is about 8871.6563842385. The cubic root of 78706287 is about 428.5516204655.

The spelling of 78706287 in words is "seventy-eight million, seven hundred six thousand, two hundred eighty-seven".