667732749 has 16 divisors (see below), whose sum is σ = 943368192. Its totient is φ = 418664448.

The previous prime is 667732739. The next prime is 667732799. The reversal of 667732749 is 947237766.

It is a happy number.

It is not a de Polignac number, because 667732749 - 2⁴ = 667732733 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667732739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80877 + ... + 88749.

It is an arithmetic number, because the mean of its divisors is an integer number (58960512).

Almost surely, 2^667732749 is an apocalyptic number.

It is an amenable number.

667732749 is a deficient number, since it is larger than the sum of its proper divisors (275635443).

667732749 is a wasteful number, since it uses less digits than its factorization.

667732749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9556.

The product of its digits is 2667168, while the sum is 51.

The square root of 667732749 is about 25840.5253236075. The cubic root of 667732749 is about 874.0458710937.

The spelling of 667732749 in words is "six hundred sixty-seven million, seven hundred thirty-two thousand, seven hundred forty-nine".