643078797 has 16 divisors (see below), whose sum is σ = 871252992. Its totient is φ = 421827120.

The previous prime is 643078783. The next prime is 643078811. The reversal of 643078797 is 797870346.

It is an interprime number because it is at equal distance from previous prime (643078783) and next prime (643078811).

It is not a de Polignac number, because 643078797 - 2¹² = 643074701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643078747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265522 + ... + 267932.

It is an arithmetic number, because the mean of its divisors is an integer number (54453312).

Almost surely, 2^643078797 is an apocalyptic number.

643078797 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

643078797 is a deficient number, since it is larger than the sum of its proper divisors (228174195).

643078797 is a wasteful number, since it uses less digits than its factorization.

643078797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3808.

The product of its (nonzero) digits is 1778112, while the sum is 51.

The square root of 643078797 is about 25358.9983437832. The cubic root of 643078797 is about 863.1535549725.

The spelling of 643078797 in words is "six hundred forty-three million, seventy-eight thousand, seven hundred ninety-seven".