91920767 has 4 divisors (see below), whose sum is σ = 93876576. Its totient is φ = 89964960.

The previous prime is 91920739. The next prime is 91920793. The reversal of 91920767 is 76702919.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 91920767 - 2¹⁴ = 91904383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91926767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 977834 + ... + 977927.

It is an arithmetic number, because the mean of its divisors is an integer number (23469144).

Almost surely, 2^91920767 is an apocalyptic number.

91920767 is a deficient number, since it is larger than the sum of its proper divisors (1955809).

91920767 is a wasteful number, since it uses less digits than its factorization.

91920767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1955808.

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 91920767 is about 9587.5318513161. The cubic root of 91920767 is about 451.3061099188.

The spelling of 91920767 in words is "ninety-one million, nine hundred twenty thousand, seven hundred sixty-seven".