78622687 has 12 divisors (see below), whose sum is σ = 92877624. Its totient is φ = 65975520.

The previous prime is 78622673. The next prime is 78622693.

78622687 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78622687 - 2⁷ = 78622559 is a prime.

It is a super-2 number, since 2×78622687² = 12363053822199938, 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 (78622697) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19288 + ... + 23005.

It is an arithmetic number, because the mean of its divisors is an integer number (7739802).

Almost surely, 2^78622687 is an apocalyptic number.

78622687 is a deficient number, since it is larger than the sum of its proper divisors (14254937).

78622687 is a wasteful number, since it uses less digits than its factorization.

78622687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42330 (or 42317 counting only the distinct ones).

The product of its digits is 451584, while the sum is 46.

The square root of 78622687 is about 8866.9434981847. The cubic root of 78622687 is about 428.3998341674.

The spelling of 78622687 in words is "seventy-eight million, six hundred twenty-two thousand, six hundred eighty-seven".