90987773386 has 4 divisors (see below), whose sum is σ = 136481660082. Its totient is φ = 45493886692.

The previous prime is 90987773377. The next prime is 90987773389. The reversal of 90987773386 is 68337778909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68337778909 = 1171 ⋅58358479.

It can be written as a sum of positive squares in only one way, i.e., 90860647761 + 127125625 = 301431^2 + 11275^2 .

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (90987773389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22746943345 + ... + 22746943348.

Almost surely, 2^90987773386 is an apocalyptic number.

90987773386 is a deficient number, since it is larger than the sum of its proper divisors (45493886696).

90987773386 is a wasteful number, since it uses less digits than its factorization.

90987773386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45493886695.

The product of its (nonzero) digits is 96018048, while the sum is 67.

The spelling of 90987773386 in words is "ninety billion, nine hundred eighty-seven million, seven hundred seventy-three thousand, three hundred eighty-six".