1205977664 has 14 divisors (see below), whose sum is σ = 2393112054. Its totient is φ = 602988800.

The previous prime is 1205977627. The next prime is 1205977681. The reversal of 1205977664 is 4667795021.

It can be written as a sum of positive squares in only one way, i.e., 1088472064 + 117505600 = 32992^2 + 10840^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9421637 + ... + 9421764.

Almost surely, 2^1205977664 is an apocalyptic number.

It is an amenable number.

1205977664 is a deficient number, since it is larger than the sum of its proper divisors (1187134390).

1205977664 is an equidigital number, since it uses as much as digits as its factorization.

1205977664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18843413 (or 18843403 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 47.

The square root of 1205977664 is about 34727.1891174624. The cubic root of 1205977664 is about 1064.4201517804.

The spelling of 1205977664 in words is "one billion, two hundred five million, nine hundred seventy-seven thousand, six hundred sixty-four".