667547730 has 48 divisors (see below), whose sum is σ = 1799913024. Its totient is φ = 178012080.

The previous prime is 667547701. The next prime is 667547731. The reversal of 667547730 is 37745766.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (667547731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 134926 + ... + 139785.

It is an arithmetic number, because the mean of its divisors is an integer number (37498188).

Almost surely, 2^667547730 is an apocalyptic number.

667547730 is an abundant number, since it is smaller than the sum of its proper divisors (1132365294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667547730 is a wasteful number, since it uses less digits than its factorization.

667547730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274733 (or 274721 counting only the distinct ones).

The product of its (nonzero) digits is 740880, while the sum is 45.

The square root of 667547730 is about 25836.9450593525. The cubic root of 667547730 is about 873.9651351846.

The spelling of 667547730 in words is "six hundred sixty-seven million, five hundred forty-seven thousand, seven hundred thirty".