91729378 has 48 divisors (see below), whose sum is σ = 162260280. Its totient is φ = 38610432.

The previous prime is 91729357. The next prime is 91729387. The reversal of 91729378 is 87392719.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 54066609 + 37662769 = 7353^2 + 6137^2 .

It is an unprimeable number.

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 in 23 ways as a sum of consecutive naturals, for example, 272026 + ... + 272362.

Almost surely, 2^91729378 is an apocalyptic number.

91729378 is a deficient number, since it is larger than the sum of its proper divisors (70530902).

91729378 is a wasteful number, since it uses less digits than its factorization.

91729378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419 (or 400 counting only the distinct ones).

The product of its digits is 190512, while the sum is 46.

The square root of 91729378 is about 9577.5455102025. The cubic root of 91729378 is about 450.9926695334.

The spelling of 91729378 in words is "ninety-one million, seven hundred twenty-nine thousand, three hundred seventy-eight".