78299287 has 4 divisors (see below), whose sum is σ = 85417416. Its totient is φ = 71181160.

The previous prime is 78299257. The next prime is 78299303.

78299287 is nontrivially palindromic in base 10.

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 78299287 - 2¹¹ = 78297239 is a prime.

It is a super-2 number, since 2×78299287² = 12261556689416738, 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 (78299237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3559048 + ... + 3559069.

It is an arithmetic number, because the mean of its divisors is an integer number (21354354).

Almost surely, 2^78299287 is an apocalyptic number.

78299287 is a deficient number, since it is larger than the sum of its proper divisors (7118129).

78299287 is a wasteful number, since it uses less digits than its factorization.

78299287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7118128.

The product of its digits is 1016064, while the sum is 52.

The square root of 78299287 is about 8848.6884338867. The cubic root of 78299287 is about 427.8116455835.

The spelling of 78299287 in words is "seventy-eight million, two hundred ninety-nine thousand, two hundred eighty-seven".