670256761 has 4 divisors (see below), whose sum is σ = 670370724. Its totient is φ = 670142800.

The previous prime is 670256759. The next prime is 670256767. The reversal of 670256761 is 167652076.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 307125625 + 363131136 = 17525^2 + 19056^2 .

It is a cyclic number.

It is not a de Polignac number, because 670256761 - 2¹ = 670256759 is a prime.

It is a super-2 number, since 2×670256761² = 898488251332422242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670256767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47650 + ... + 60091.

It is an arithmetic number, because the mean of its divisors is an integer number (167592681).

Almost surely, 2^670256761 is an apocalyptic number.

It is an amenable number.

670256761 is a deficient number, since it is larger than the sum of its proper divisors (113963).

670256761 is a wasteful number, since it uses less digits than its factorization.

670256761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113962.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 670256761 is about 25889.3175074199. The cubic root of 670256761 is about 875.1457764195.

The spelling of 670256761 in words is "six hundred seventy million, two hundred fifty-six thousand, seven hundred sixty-one".