91200006 has 20 divisors (see below), whose sum is σ = 204355932. Its totient is φ = 30399948.

The previous prime is 91199993. The next prime is 91200007. The reversal of 91200006 is 60000219.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91200007) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 281320 + ... + 281643.

Almost surely, 2^91200006 is an apocalyptic number.

91200006 is an abundant number, since it is smaller than the sum of its proper divisors (113155926).

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

91200006 is a wasteful number, since it uses less digits than its factorization.

91200006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562977 (or 562968 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 91200006 is about 9549.8694231911. The cubic root of 91200006 is about 450.1234328066.

The spelling of 91200006 in words is "ninety-one million, two hundred thousand, six".