670787765 has 16 divisors (see below), whose sum is σ = 842628096. Its totient is φ = 511996800.

The previous prime is 670787743. The next prime is 670787773. The reversal of 670787765 is 567787076.

It is not a de Polignac number, because 670787765 - 2⁶ = 670787701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 19472 + ... + 41481.

It is an arithmetic number, because the mean of its divisors is an integer number (52664256).

Almost surely, 2^670787765 is an apocalyptic number.

It is an amenable number.

670787765 is a deficient number, since it is larger than the sum of its proper divisors (171840331).

670787765 is a wasteful number, since it uses less digits than its factorization.

670787765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61060.

The product of its (nonzero) digits is 3457440, while the sum is 53.

The square root of 670787765 is about 25899.5707493387. The cubic root of 670787765 is about 875.3768238178.

The spelling of 670787765 in words is "six hundred seventy million, seven hundred eighty-seven thousand, seven hundred sixty-five".