622778687 has 4 divisors (see below), whose sum is σ = 622861080. Its totient is φ = 622696296.

The previous prime is 622778669. The next prime is 622778693. The reversal of 622778687 is 786877226.

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 622778687 - 2²⁰ = 621730111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (622778617) 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, 28568 + ... + 45405.

It is an arithmetic number, because the mean of its divisors is an integer number (155715270).

Almost surely, 2^622778687 is an apocalyptic number.

622778687 is a deficient number, since it is larger than the sum of its proper divisors (82393).

622778687 is an equidigital number, since it uses as much as digits as its factorization.

622778687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82392.

The product of its digits is 3161088, while the sum is 53.

The square root of 622778687 is about 24955.5341958452. The cubic root of 622778687 is about 853.9738664951.

The spelling of 622778687 in words is "six hundred twenty-two million, seven hundred seventy-eight thousand, six hundred eighty-seven".