670540649 has 8 divisors (see below), whose sum is σ = 682046400. Its totient is φ = 659116656.

The previous prime is 670540631. The next prime is 670540679. The reversal of 670540649 is 946045076.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 670540649 - 2⁸ = 670540393 is a prime.

It is a super-2 number, since 2×670540649² = 899249523922682402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670540679) 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 7 ways as a sum of consecutive naturals, for example, 3782 + ... + 36815.

It is an arithmetic number, because the mean of its divisors is an integer number (85255800).

Almost surely, 2^670540649 is an apocalyptic number.

It is an amenable number.

670540649 is a deficient number, since it is larger than the sum of its proper divisors (11505751).

670540649 is a wasteful number, since it uses less digits than its factorization.

670540649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40879.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 670540649 is about 25894.7996516675. The cubic root of 670540649 is about 875.2693153033.

The spelling of 670540649 in words is "six hundred seventy million, five hundred forty thousand, six hundred forty-nine".