73478581 has 6 divisors (see below), whose sum is σ = 80765846. Its totient is φ = 66798600.

The previous prime is 73478569. The next prime is 73478593. The reversal of 73478581 is 18587437.

It is an interprime number because it is at equal distance from previous prime (73478569) and next prime (73478593).

It can be written as a sum of positive squares in only one way, i.e., 64657681 + 8820900 = 8041^2 + 2970^2 .

It is not a de Polignac number, because 73478581 - 2⁵ = 73478549 is a prime.

It is a super-2 number, since 2×73478581² = 10798203731547122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73478501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 303510 + ... + 303751.

Almost surely, 2^73478581 is an apocalyptic number.

It is an amenable number.

73478581 is a deficient number, since it is larger than the sum of its proper divisors (7287265).

73478581 is a wasteful number, since it uses less digits than its factorization.

73478581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607283 (or 607272 counting only the distinct ones).

The product of its digits is 188160, while the sum is 43.

The square root of 73478581 is about 8571.9648272727. The cubic root of 73478581 is about 418.8452425818.

The spelling of 73478581 in words is "seventy-three million, four hundred seventy-eight thousand, five hundred eighty-one".