73280391 has 8 divisors (see below), whose sum is σ = 97764480. Its totient is φ = 48824952.

The previous prime is 73280371. The next prime is 73280401. The reversal of 73280391 is 19308237.

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

It is a de Polignac number, because none of the positive numbers 2^k-73280391 is a prime.

It is a super-2 number, since 2×73280391² = 10740031410225762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73280371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235 + ... + 12108.

It is an arithmetic number, because the mean of its divisors is an integer number (12220560).

Almost surely, 2^73280391 is an apocalyptic number.

73280391 is a deficient number, since it is larger than the sum of its proper divisors (24484089).

73280391 is a wasteful number, since it uses less digits than its factorization.

73280391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14325.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 73280391 is about 8560.3966613703. The cubic root of 73280391 is about 418.4683269181.

The spelling of 73280391 in words is "seventy-three million, two hundred eighty thousand, three hundred ninety-one".