91087378 has 4 divisors (see below), whose sum is σ = 136631070. Its totient is φ = 45543688.

The previous prime is 91087369. The next prime is 91087417. The reversal of 91087378 is 87378019.

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

It can be written as a sum of positive squares in only one way, i.e., 90573289 + 514089 = 9517^2 + 717^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22771843 + ... + 22771846.

Almost surely, 2^91087378 is an apocalyptic number.

91087378 is a deficient number, since it is larger than the sum of its proper divisors (45543692).

91087378 is a wasteful number, since it uses less digits than its factorization.

91087378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45543691.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 91087378 is about 9543.9707669292. The cubic root of 91087378 is about 449.9380622572.

It can be divided in two parts, 910 and 87378, that added together give a palindrome (88288).

The spelling of 91087378 in words is "ninety-one million, eighty-seven thousand, three hundred seventy-eight".