2578600781 has 4 divisors (see below), whose sum is σ = 2648292732. Its totient is φ = 2508908832.

The previous prime is 2578600729. The next prime is 2578600819. The reversal of 2578600781 is 1870068752.

2578600781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2503501225 + 75099556 = 50035^2 + 8666^2 .

It is a cyclic number.

It is not a de Polignac number, because 2578600781 - 2²² = 2574406477 is a prime.

It is a super-2 number, since 2×2578600781² = 13298363975547619922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2578500781) 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, 34845920 + ... + 34845993.

It is an arithmetic number, because the mean of its divisors is an integer number (662073183).

Almost surely, 2^2578600781 is an apocalyptic number.

It is an amenable number.

2578600781 is a deficient number, since it is larger than the sum of its proper divisors (69691951).

2578600781 is an equidigital number, since it uses as much as digits as its factorization.

2578600781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69691950.

The product of its (nonzero) digits is 188160, while the sum is 44.

The square root of 2578600781 is about 50779.9249802518. The cubic root of 2578600781 is about 1371.2859825521.

The spelling of 2578600781 in words is "two billion, five hundred seventy-eight million, six hundred thousand, seven hundred eighty-one".