977649747 has 4 divisors (see below), whose sum is σ = 1303533000. Its totient is φ = 651766496.

The previous prime is 977649737. The next prime is 977649749. The reversal of 977649747 is 747946779.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 977649747 - 2⁷ = 977649619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (977649749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162941622 + ... + 162941627.

It is an arithmetic number, because the mean of its divisors is an integer number (325883250).

Almost surely, 2^977649747 is an apocalyptic number.

977649747 is a deficient number, since it is larger than the sum of its proper divisors (325883253).

977649747 is a wasteful number, since it uses less digits than its factorization.

977649747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325883252.

The product of its digits is 18670176, while the sum is 60.

The square root of 977649747 is about 31267.3911127871. The cubic root of 977649747 is about 992.4937122905.

The spelling of 977649747 in words is "nine hundred seventy-seven million, six hundred forty-nine thousand, seven hundred forty-seven".