2111700978 has 48 divisors (see below), whose sum is σ = 4855256640. Its totient is φ = 661876512.

The previous prime is 2111700977. The next prime is 2111700979. The reversal of 2111700978 is 8790071112.

It is an interprime number because it is at equal distance from previous prime (2111700977) and next prime (2111700979).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2111700973) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18801 + ... + 67652.

It is an arithmetic number, because the mean of its divisors is an integer number (101151180).

Almost surely, 2^2111700978 is an apocalyptic number.

2111700978 is an abundant number, since it is smaller than the sum of its proper divisors (2743555662).

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

2111700978 is a wasteful number, since it uses less digits than its factorization.

2111700978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86543 (or 86540 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 36.

The square root of 2111700978 is about 45953.2477415906. The cubic root of 2111700978 is about 1282.9531784252.

The spelling of 2111700978 in words is "two billion, one hundred eleven million, seven hundred thousand, nine hundred seventy-eight".