966720639 has 8 divisors (see below), whose sum is σ = 1289973760. Its totient is φ = 643973976.

The previous prime is 966720637. The next prime is 966720641. The reversal of 966720639 is 936027669.

It is an interprime number because it is at equal distance from previous prime (966720637) and next prime (966720641).

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

It is not a de Polignac number, because 966720639 - 2¹ = 966720637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (966720631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122137 + ... + 129810.

It is an arithmetic number, because the mean of its divisors is an integer number (161246720).

Almost surely, 2^966720639 is an apocalyptic number.

966720639 is a deficient number, since it is larger than the sum of its proper divisors (323253121).

966720639 is a wasteful number, since it uses less digits than its factorization.

966720639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253229.

The product of its (nonzero) digits is 734832, while the sum is 48.

The square root of 966720639 is about 31092.1314644075. The cubic root of 966720639 is about 988.7814954569.

The spelling of 966720639 in words is "nine hundred sixty-six million, seven hundred twenty thousand, six hundred thirty-nine".