78436287 has 6 divisors (see below), whose sum is σ = 113296872. Its totient is φ = 52290852.

The previous prime is 78436277. The next prime is 78436289. The reversal of 78436287 is 78263487.

It is a happy number.

It is not a de Polignac number, because 78436287 - 2⁶ = 78436223 is a prime.

It is a super-2 number, since 2×78436287² = 12304502236692738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78436289) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4357563 + ... + 4357580.

It is an arithmetic number, because the mean of its divisors is an integer number (18882812).

Almost surely, 2^78436287 is an apocalyptic number.

78436287 is a deficient number, since it is larger than the sum of its proper divisors (34860585).

78436287 is a wasteful number, since it uses less digits than its factorization.

78436287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8715149 (or 8715146 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 78436287 is about 8856.4263108773. The cubic root of 78436287 is about 428.0610137346.

The spelling of 78436287 in words is "seventy-eight million, four hundred thirty-six thousand, two hundred eighty-seven".