2780725 has 6 divisors (see below), whose sum is σ = 3448130. Its totient is φ = 2224560.

The previous prime is 2780719. The next prime is 2780753. The reversal of 2780725 is 5270872.

It can be written as a sum of positive squares in 3 ways, for example, as 191844 + 2588881 = 438^2 + 1609^2 .

It is not a de Polignac number, because 2780725 - 2⁵ = 2780693 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55590 + ... + 55639.

2^2780725 is an apocalyptic number.

2780725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2780725 is a deficient number, since it is larger than the sum of its proper divisors (667405).

2780725 is a wasteful number, since it uses less digits than its factorization.

2780725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111239 (or 111234 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 2780725 is about 1667.5505989325. The cubic root of 2780725 is about 140.6218089811.

The spelling of 2780725 in words is "two million, seven hundred eighty thousand, seven hundred twenty-five".