73556409 has 8 divisors (see below), whose sum is σ = 98617792. Its totient is φ = 48766320.

The previous prime is 73556393. The next prime is 73556443. The reversal of 73556409 is 90465537.

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

It is not a de Polignac number, because 73556409 - 2⁴ = 73556393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73556489) 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, 67189 + ... + 68274.

It is an arithmetic number, because the mean of its divisors is an integer number (12327224).

Almost surely, 2^73556409 is an apocalyptic number.

It is an amenable number.

73556409 is a deficient number, since it is larger than the sum of its proper divisors (25061383).

73556409 is a wasteful number, since it uses less digits than its factorization.

73556409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135647.

The product of its (nonzero) digits is 113400, while the sum is 39.

The square root of 73556409 is about 8576.5033084585. The cubic root of 73556409 is about 418.9930697205.

The spelling of 73556409 in words is "seventy-three million, five hundred fifty-six thousand, four hundred nine".