90781767 has 6 divisors (see below), whose sum is σ = 131129232. Its totient is φ = 60521172.

The previous prime is 90781763. The next prime is 90781771. The reversal of 90781767 is 76718709.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (90781763) and next prime (90781771).

It is not a de Polignac number, because 90781767 - 2² = 90781763 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90781763) 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 5 ways as a sum of consecutive naturals, for example, 5043423 + ... + 5043440.

It is an arithmetic number, because the mean of its divisors is an integer number (21854872).

Almost surely, 2^90781767 is an apocalyptic number.

90781767 is a deficient number, since it is larger than the sum of its proper divisors (40347465).

90781767 is a wasteful number, since it uses less digits than its factorization.

90781767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10086869 (or 10086866 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 45.

The square root of 90781767 is about 9527.9466308329. The cubic root of 90781767 is about 449.4342965490.

The spelling of 90781767 in words is "ninety million, seven hundred eighty-one thousand, seven hundred sixty-seven".