2897780978 has 8 divisors (see below), whose sum is σ = 4496556780. Its totient is φ = 1398928720.

The previous prime is 2897780969. The next prime is 2897780981. The reversal of 2897780978 is 8790877982.

It can be written as a sum of positive squares in 2 ways, for example, as 2773391569 + 124389409 = 52663^2 + 11153^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24980813 + ... + 24980928.

Almost surely, 2^2897780978 is an apocalyptic number.

2897780978 is a deficient number, since it is larger than the sum of its proper divisors (1598775802).

2897780978 is a wasteful number, since it uses less digits than its factorization.

2897780978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49961772.

The product of its (nonzero) digits is 28449792, while the sum is 65.

The square root of 2897780978 is about 53831.0410265304. The cubic root of 2897780978 is about 1425.6793277657.

The spelling of 2897780978 in words is "two billion, eight hundred ninety-seven million, seven hundred eighty thousand, nine hundred seventy-eight".