90350721646 has 4 divisors (see below), whose sum is σ = 135526082472. Its totient is φ = 45175360822.

The previous prime is 90350721607. The next prime is 90350721647. The reversal of 90350721646 is 64612705309.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90350721647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22587680410 + ... + 22587680413.

It is an arithmetic number, because the mean of its divisors is an integer number (33881520618).

Almost surely, 2^90350721646 is an apocalyptic number.

90350721646 is a deficient number, since it is larger than the sum of its proper divisors (45175360826).

90350721646 is a wasteful number, since it uses less digits than its factorization.

90350721646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45175360825.

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 90350721646 in words is "ninety billion, three hundred fifty million, seven hundred twenty-one thousand, six hundred forty-six".