2778223725 has 96 divisors (see below), whose sum is σ = 5470899840. Its totient is φ = 1377285120.

The previous prime is 2778223703. The next prime is 2778223727. The reversal of 2778223725 is 5273228772.

2778223725 is a `hidden beast` number, since 277 + 8 + 2 + 2 + 372 + 5 = 666.

It is not a de Polignac number, because 2778223725 - 2⁷ = 2778223597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778223727) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 950967 + ... + 953883.

It is an arithmetic number, because the mean of its divisors is an integer number (56988540).

Almost surely, 2^2778223725 is an apocalyptic number.

2778223725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2778223725 is a deficient number, since it is larger than the sum of its proper divisors (2692676115).

2778223725 is a wasteful number, since it uses less digits than its factorization.

2778223725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3036 (or 3025 counting only the distinct ones).

The product of its digits is 658560, while the sum is 45.

The square root of 2778223725 is about 52708.8581265047. The cubic root of 2778223725 is about 1405.7963301019.

The spelling of 2778223725 in words is "two billion, seven hundred seventy-eight million, two hundred twenty-three thousand, seven hundred twenty-five".