2678781554 has 4 divisors (see below), whose sum is σ = 4018172334. Its totient is φ = 1339390776.

The previous prime is 2678781551. The next prime is 2678781559. The reversal of 2678781554 is 4551878762.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4551878762 = 2 ⋅2275939381.

It can be written as a sum of positive squares in only one way, i.e., 1907330929 + 771450625 = 43673^2 + 27775^2 .

It is a super-2 number, since 2×2678781554² = 14351741228101309832, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2678781496 and 2678781505.

It is not an unprimeable number, because it can be changed into a prime (2678781551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669695387 + ... + 669695390.

Almost surely, 2^2678781554 is an apocalyptic number.

2678781554 is a deficient number, since it is larger than the sum of its proper divisors (1339390780).

2678781554 is a wasteful number, since it uses less digits than its factorization.

2678781554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339390779.

The product of its digits is 3763200, while the sum is 53.

The square root of 2678781554 is about 51756.9469153659. The cubic root of 2678781554 is about 1388.8193749780.

The spelling of 2678781554 in words is "two billion, six hundred seventy-eight million, seven hundred eighty-one thousand, five hundred fifty-four".