2978660985 has 32 divisors (see below), whose sum is σ = 4818506880. Its totient is φ = 1571125248.

The previous prime is 2978660983. The next prime is 2978661031. The reversal of 2978660985 is 5890668792.

It is a happy number.

It is not a de Polignac number, because 2978660985 - 2¹ = 2978660983 is a prime.

It is a super-2 number, since 2×2978660985² = 17744842527122340450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2978660981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1099002 + ... + 1101708.

It is an arithmetic number, because the mean of its divisors is an integer number (150578340).

Almost surely, 2^2978660985 is an apocalyptic number.

It is an amenable number.

2978660985 is a deficient number, since it is larger than the sum of its proper divisors (1839845895).

2978660985 is a wasteful number, since it uses less digits than its factorization.

2978660985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3497.

The product of its (nonzero) digits is 13063680, while the sum is 60.

The square root of 2978660985 is about 54577.1104493450. The cubic root of 2978660985 is about 1438.8218541596.

The spelling of 2978660985 in words is "two billion, nine hundred seventy-eight million, six hundred sixty thousand, nine hundred eighty-five".