772780 has 12 divisors (see below), whose sum is σ = 1622880. Its totient is φ = 309104.

The previous prime is 772771. The next prime is 772789. The reversal of 772780 is 87277.

It is an interprime number because it is at equal distance from previous prime (772771) and next prime (772789).

It is not an unprimeable number, because it can be changed into a prime (772789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19300 + ... + 19339.

It is an arithmetic number, because the mean of its divisors is an integer number (135240).

2⁷⁷²⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

772780 is an abundant number, since it is smaller than the sum of its proper divisors (850100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

772780 is a wasteful number, since it uses less digits than its factorization.

772780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38648 (or 38646 counting only the distinct ones).

The product of its (nonzero) digits is 5488, while the sum is 31.

The square root of 772780 is about 879.0790635660. The cubic root of 772780 is about 91.7667373633.

The spelling of 772780 in words is "seven hundred seventy-two thousand, seven hundred eighty".