90393788 has 12 divisors (see below), whose sum is σ = 159756072. Its totient is φ = 44749200.

The previous prime is 90393781. The next prime is 90393791. The reversal of 90393788 is 88739309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90393781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111470 + ... + 112277.

It is an arithmetic number, because the mean of its divisors is an integer number (13313006).

Almost surely, 2^90393788 is an apocalyptic number.

It is an amenable number.

90393788 is a deficient number, since it is larger than the sum of its proper divisors (69362284).

90393788 is a wasteful number, since it uses less digits than its factorization.

90393788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223852 (or 223850 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 90393788 is about 9507.5647775863. The cubic root of 90393788 is about 448.7931249695.

The spelling of 90393788 in words is "ninety million, three hundred ninety-three thousand, seven hundred eighty-eight".