90728646 has 16 divisors (see below), whose sum is σ = 187714800. Its totient is φ = 29199968.

The previous prime is 90728641. The next prime is 90728663. The reversal of 90728646 is 64682709.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 90728598 and 90728607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90728641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260541 + ... + 260888.

It is an arithmetic number, because the mean of its divisors is an integer number (11732175).

Almost surely, 2^90728646 is an apocalyptic number.

90728646 is an abundant number, since it is smaller than the sum of its proper divisors (96986154).

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

90728646 is a wasteful number, since it uses less digits than its factorization.

90728646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521463.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 90728646 is about 9525.1585813571. The cubic root of 90728646 is about 449.3466172044.

The spelling of 90728646 in words is "ninety million, seven hundred twenty-eight thousand, six hundred forty-six".