90780786 has 24 divisors (see below), whose sum is σ = 197197884. Its totient is φ = 30182400.

The previous prime is 90780757. The next prime is 90780787. The reversal of 90780786 is 68708709.

It can be written as a sum of positive squares in 2 ways, for example, as 62489025 + 28291761 = 7905^2 + 5319^2 .

It is a super-2 number, since 2×90780786² = 16482302213555592, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90780787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 930 + ... + 13506.

Almost surely, 2^90780786 is an apocalyptic number.

90780786 is an abundant number, since it is smaller than the sum of its proper divisors (106417098).

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

90780786 is a wasteful number, since it uses less digits than its factorization.

90780786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12986 (or 12983 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 90780786 is about 9527.8951505566. The cubic root of 90780786 is about 449.4326776606.

The spelling of 90780786 in words is "ninety million, seven hundred eighty thousand, seven hundred eighty-six".