91620867 has 8 divisors (see below), whose sum is σ = 131558224. Its totient is φ = 56382048.

The previous prime is 91620863. The next prime is 91620883. The reversal of 91620867 is 76802619.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91620867 - 2² = 91620863 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 2349253 = 91620867 / (9 + 1 + 6 + 2 + 0 + 8 + 6 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91620863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1174588 + ... + 1174665.

It is an arithmetic number, because the mean of its divisors is an integer number (16444778).

Almost surely, 2^91620867 is an apocalyptic number.

91620867 is a deficient number, since it is larger than the sum of its proper divisors (39937357).

91620867 is a wasteful number, since it uses less digits than its factorization.

91620867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2349269.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 91620867 is about 9571.8789691471. The cubic root of 91620867 is about 450.8147658773.

The spelling of 91620867 in words is "ninety-one million, six hundred twenty thousand, eight hundred sixty-seven".