2672652781 has 4 divisors (see below), whose sum is σ = 2676423100. Its totient is φ = 2668882464.

The previous prime is 2672652767. The next prime is 2672652799. The reversal of 2672652781 is 1872562762.

It is the 21106-th star number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1119504681 + 1553148100 = 33459^2 + 39410^2 .

It is a cyclic number.

It is not a de Polignac number, because 2672652781 - 2²⁵ = 2639098349 is a prime.

It is a super-2 number, since 2×2672652781² = 14286145775574067922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2672652721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1884096 + ... + 1885513.

It is an arithmetic number, because the mean of its divisors is an integer number (669105775).

Almost surely, 2^2672652781 is an apocalyptic number.

2672652781 is the 32697-th centered pentagonal number.

It is an amenable number.

2672652781 is a deficient number, since it is larger than the sum of its proper divisors (3770319).

2672652781 is an equidigital number, since it uses as much as digits as its factorization.

2672652781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3770318.

The product of its digits is 564480, while the sum is 46.

The square root of 2672652781 is about 51697.7057614746. The cubic root of 2672652781 is about 1387.7594082086.

It can be divided in two parts, 26726 and 52781, that added together give a cube (79507 = 43³).

The spelling of 2672652781 in words is "two billion, six hundred seventy-two million, six hundred fifty-two thousand, seven hundred eighty-one".