2278751645 has 8 divisors (see below), whose sum is σ = 2762693304. Its totient is φ = 1804207104.

The previous prime is 2278751609. The next prime is 2278751653. The reversal of 2278751645 is 5461578722.

It can be written as a sum of positive squares in 4 ways, for example, as 156675289 + 2122076356 = 12517^2 + 46066^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2278751645 - 2⁶ = 2278751581 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2278751645.

It is a congruent 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, 2348744 + ... + 2349713.

It is an arithmetic number, because the mean of its divisors is an integer number (345336663).

Almost surely, 2^2278751645 is an apocalyptic number.

It is an amenable number.

2278751645 is a deficient number, since it is larger than the sum of its proper divisors (483941659).

2278751645 is an equidigital number, since it uses as much as digits as its factorization.

2278751645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4698559.

The product of its digits is 940800, while the sum is 47.

The square root of 2278751645 is about 47736.2717961929. The cubic root of 2278751645 is about 1315.9286177919.

The spelling of 2278751645 in words is "two billion, two hundred seventy-eight million, seven hundred fifty-one thousand, six hundred forty-five".