812720667 has 16 divisors (see below), whose sum is σ = 1182943872. Its totient is φ = 492222720.

The previous prime is 812720641. The next prime is 812720723. The reversal of 812720667 is 766027218.

It is not a de Polignac number, because 812720667 - 2¹² = 812716571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (812720627) 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, 46123 + ... + 61259.

It is an arithmetic number, because the mean of its divisors is an integer number (73933992).

Almost surely, 2^812720667 is an apocalyptic number.

812720667 is a deficient number, since it is larger than the sum of its proper divisors (370223205).

812720667 is a wasteful number, since it uses less digits than its factorization.

812720667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16778.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 812720667 is about 28508.2561199383. The cubic root of 812720667 is about 933.2122576644.

The spelling of 812720667 in words is "eight hundred twelve million, seven hundred twenty thousand, six hundred sixty-seven".