664340547 has 16 divisors (see below), whose sum is σ = 958878368. Its totient is φ = 406702080.

The previous prime is 664340543. The next prime is 664340557. The reversal of 664340547 is 745043466.

It is a happy number.

It is not a de Polignac number, because 664340547 - 2² = 664340543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664340543) 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, 36604 + ... + 51657.

It is an arithmetic number, because the mean of its divisors is an integer number (59929898).

Almost surely, 2^664340547 is an apocalyptic number.

664340547 is a deficient number, since it is larger than the sum of its proper divisors (294537821).

664340547 is a wasteful number, since it uses less digits than its factorization.

664340547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88470.

The product of its (nonzero) digits is 241920, while the sum is 39.

The square root of 664340547 is about 25774.8044997435. The cubic root of 664340547 is about 872.5632543912.

The spelling of 664340547 in words is "six hundred sixty-four million, three hundred forty thousand, five hundred forty-seven".