667894749 has 16 divisors (see below), whose sum is σ = 906852672. Its totient is φ = 437174528.

The previous prime is 667894741. The next prime is 667894757. The reversal of 667894749 is 947498766.

It is an interprime number because it is at equal distance from previous prime (667894741) and next prime (667894757).

It is a cyclic number.

It is not a de Polignac number, because 667894749 - 2³ = 667894741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 667894692 and 667894701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667894741) 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 15 ways as a sum of consecutive naturals, for example, 27067 + ... + 45479.

It is an arithmetic number, because the mean of its divisors is an integer number (56678292).

Almost surely, 2^667894749 is an apocalyptic number.

It is an amenable number.

667894749 is a deficient number, since it is larger than the sum of its proper divisors (238957923).

667894749 is a wasteful number, since it uses less digits than its factorization.

667894749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18636.

The product of its digits is 18289152, while the sum is 60.

The square root of 667894749 is about 25843.6597447033. The cubic root of 667894749 is about 874.1165500602.

The spelling of 667894749 in words is "six hundred sixty-seven million, eight hundred ninety-four thousand, seven hundred forty-nine".