1977720086 has 8 divisors (see below), whose sum is σ = 2999912760. Its totient is φ = 977749168.

The previous prime is 1977720079. The next prime is 1977720119. The reversal of 1977720086 is 6800277791.

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

It is a super-2 number, since 2×1977720086² = 7822753477135694792, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1977720086.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5555216 + ... + 5555571.

It is an arithmetic number, because the mean of its divisors is an integer number (374989095).

Almost surely, 2^1977720086 is an apocalyptic number.

1977720086 is a deficient number, since it is larger than the sum of its proper divisors (1022192674).

1977720086 is a wasteful number, since it uses less digits than its factorization.

1977720086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11110878.

The product of its (nonzero) digits is 296352, while the sum is 47.

The square root of 1977720086 is about 44471.5649151230. The cubic root of 1977720086 is about 1255.2250800780.

The spelling of 1977720086 in words is "one billion, nine hundred seventy-seven million, seven hundred twenty thousand, eighty-six".