90820749 has 8 divisors (see below), whose sum is σ = 128217600. Its totient is φ = 56985536.

The previous prime is 90820733. The next prime is 90820753. The reversal of 90820749 is 94702809.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90820749 - 2⁴ = 90820733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90820729) 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 7 ways as a sum of consecutive naturals, for example, 890349 + ... + 890450.

It is an arithmetic number, because the mean of its divisors is an integer number (16027200).

Almost surely, 2^90820749 is an apocalyptic number.

It is an amenable number.

90820749 is a deficient number, since it is larger than the sum of its proper divisors (37396851).

90820749 is a wasteful number, since it uses less digits than its factorization.

90820749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1780819.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 90820749 is about 9529.9920776462. The cubic root of 90820749 is about 449.4986168827.

The spelling of 90820749 in words is "ninety million, eight hundred twenty thousand, seven hundred forty-nine".