90681788 has 6 divisors (see below), whose sum is σ = 158693136. Its totient is φ = 45340892.

The previous prime is 90681779. The next prime is 90681803. The reversal of 90681788 is 88718609.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11335220 + ... + 11335227.

It is an arithmetic number, because the mean of its divisors is an integer number (26448856).

Almost surely, 2^90681788 is an apocalyptic number.

It is an amenable number.

90681788 is a deficient number, since it is larger than the sum of its proper divisors (68011348).

90681788 is a wasteful number, since it uses less digits than its factorization.

90681788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22670451 (or 22670449 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 90681788 is about 9522.6985671080. The cubic root of 90681788 is about 449.2692468973.

The spelling of 90681788 in words is "ninety million, six hundred eighty-one thousand, seven hundred eighty-eight".