2640241778 has 16 divisors (see below), whose sum is σ = 4016580480. Its totient is φ = 1301432496.

The previous prime is 2640241757. The next prime is 2640241823. The reversal of 2640241778 is 8771420462.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94625 + ... + 119307.

It is an arithmetic number, because the mean of its divisors is an integer number (251036280).

Almost surely, 2^2640241778 is an apocalyptic number.

2640241778 is a deficient number, since it is larger than the sum of its proper divisors (1376338702).

2640241778 is a wasteful number, since it uses less digits than its factorization.

2640241778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25441.

The product of its (nonzero) digits is 150528, while the sum is 41.

The square root of 2640241778 is about 51383.2830597657. The cubic root of 2640241778 is about 1382.1268363382.

The spelling of 2640241778 in words is "two billion, six hundred forty million, two hundred forty-one thousand, seven hundred seventy-eight".