91678740 has 24 divisors (see below), whose sum is σ = 256700640. Its totient is φ = 24447648.

The previous prime is 91678733. The next prime is 91678771. The reversal of 91678740 is 4787619.

It is a junction number, because it is equal to n+sod(n) for n = 91678692 and 91678701.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 763930 + ... + 764049.

It is an arithmetic number, because the mean of its divisors is an integer number (10695860).

Almost surely, 2^91678740 is an apocalyptic number.

It is an amenable number.

91678740 is an abundant number, since it is smaller than the sum of its proper divisors (165021900).

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

91678740 is a wasteful number, since it uses less digits than its factorization.

91678740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527991 (or 1527989 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 91678740 is about 9574.9015660737. The cubic root of 91678740 is about 450.9096660619.

The spelling of 91678740 in words is "ninety-one million, six hundred seventy-eight thousand, seven hundred forty".