2978555257 has 8 divisors (see below), whose sum is σ = 3035750400. Its totient is φ = 2921887584.

The previous prime is 2978555221. The next prime is 2978555317. The reversal of 2978555257 is 7525558792.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2978555257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2978555198 and 2978555207.

It is not an unprimeable number, because it can be changed into a prime (2978555207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120457 + ... + 143062.

It is an arithmetic number, because the mean of its divisors is an integer number (379468800).

Almost surely, 2^2978555257 is an apocalyptic number.

It is an amenable number.

2978555257 is a deficient number, since it is larger than the sum of its proper divisors (57195143).

2978555257 is a wasteful number, since it uses less digits than its factorization.

2978555257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263735.

The product of its digits is 8820000, while the sum is 55.

The square root of 2978555257 is about 54576.1418295577. The cubic root of 2978555257 is about 1438.8048302286.

The spelling of 2978555257 in words is "two billion, nine hundred seventy-eight million, five hundred fifty-five thousand, two hundred fifty-seven".