73000991 has 4 divisors (see below), whose sum is σ = 83429712. Its totient is φ = 62572272.

The previous prime is 73000969. The next prime is 73000999. The reversal of 73000991 is 19900037.

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

It is not a de Polignac number, because 73000991 - 2⁶ = 73000927 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 (73000999) 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, 5214350 + ... + 5214363.

It is an arithmetic number, because the mean of its divisors is an integer number (20857428).

Almost surely, 2^73000991 is an apocalyptic number.

73000991 is a deficient number, since it is larger than the sum of its proper divisors (10428721).

73000991 is a wasteful number, since it uses less digits than its factorization.

73000991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10428720.

The product of its (nonzero) digits is 1701, while the sum is 29.

The square root of 73000991 is about 8544.0617390091. The cubic root of 73000991 is about 417.9358108283.

The spelling of 73000991 in words is "seventy-three million, nine hundred ninety-one", and thus it is an aban number.