73027981 has 4 divisors (see below), whose sum is σ = 78645532. Its totient is φ = 67410432.

The previous prime is 73027951. The next prime is 73027993. The reversal of 73027981 is 18972037.

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

It can be written as a sum of positive squares in 2 ways, for example, as 40068900 + 32959081 = 6330^2 + 5741^2 .

It is a cyclic number.

It is not a de Polignac number, because 73027981 - 2¹⁹ = 72503693 is a prime.

It is a super-2 number, since 2×73027981² = 10666172017872722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 73027981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73027951) 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, 2808756 + ... + 2808781.

It is an arithmetic number, because the mean of its divisors is an integer number (19661383).

Almost surely, 2^73027981 is an apocalyptic number.

It is an amenable number.

73027981 is a deficient number, since it is larger than the sum of its proper divisors (5617551).

73027981 is a wasteful number, since it uses less digits than its factorization.

73027981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5617550.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 73027981 is about 8545.6410526069. The cubic root of 73027981 is about 417.9873110317.

The spelling of 73027981 in words is "seventy-three million, twenty-seven thousand, nine hundred eighty-one".