670172761 has 4 divisors (see below), whose sum is σ = 672843024. Its totient is φ = 667502500.

The previous prime is 670172753. The next prime is 670172771. The reversal of 670172761 is 167271076.

670172761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 670172761 - 2³ = 670172753 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 670172761.

It is not an unprimeable number, because it can be changed into a prime (670172771) 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, 1334755 + ... + 1335256.

It is an arithmetic number, because the mean of its divisors is an integer number (168210756).

Almost surely, 2^670172761 is an apocalyptic number.

It is an amenable number.

670172761 is a deficient number, since it is larger than the sum of its proper divisors (2670263).

670172761 is a wasteful number, since it uses less digits than its factorization.

670172761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2670262.

The product of its (nonzero) digits is 24696, while the sum is 37.

The square root of 670172761 is about 25887.6951658505. The cubic root of 670172761 is about 875.1092156463.

The spelling of 670172761 in words is "six hundred seventy million, one hundred seventy-two thousand, seven hundred sixty-one".