977721066 has 24 divisors (see below), whose sum is σ = 2421023904. Its totient is φ = 279348840.

The previous prime is 977720999. The next prime is 977721067. The reversal of 977721066 is 660127779.

It is not an unprimeable number, because it can be changed into a prime (977721067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3879720 + ... + 3879971.

It is an arithmetic number, because the mean of its divisors is an integer number (100875996).

Almost surely, 2^977721066 is an apocalyptic number.

977721066 is an abundant number, since it is smaller than the sum of its proper divisors (1443302838).

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

977721066 is a wasteful number, since it uses less digits than its factorization.

977721066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7759706 (or 7759703 counting only the distinct ones).

The product of its (nonzero) digits is 222264, while the sum is 45.

The square root of 977721066 is about 31268.5315612998. The cubic root of 977721066 is about 992.5178456566.

The spelling of 977721066 in words is "nine hundred seventy-seven million, seven hundred twenty-one thousand, sixty-six".