78288287 has 8 divisors (see below), whose sum is σ = 97606272. Its totient is φ = 61003800.

The previous prime is 78288277. The next prime is 78288307.

It is a happy number.

78288287 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78288287 - 2⁸ = 78288031 is a prime.

It is a super-2 number, since 2×78288287² = 12258111762788738, 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 (78288257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 508289 + ... + 508442.

It is an arithmetic number, because the mean of its divisors is an integer number (12200784).

Almost surely, 2^78288287 is an apocalyptic number.

78288287 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

78288287 is a deficient number, since it is larger than the sum of its proper divisors (19317985).

78288287 is a wasteful number, since it uses less digits than its factorization.

78288287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016749.

The product of its digits is 802816, while the sum is 50.

The square root of 78288287 is about 8848.0668510133. The cubic root of 78288287 is about 427.7916107119.

The spelling of 78288287 in words is "seventy-eight million, two hundred eighty-eight thousand, two hundred eighty-seven".