72559999 has 4 divisors (see below), whose sum is σ = 73478560. Its totient is φ = 71641440.

The previous prime is 72559969. The next prime is 72560023. The reversal of 72559999 is 99995527.

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

It is a cyclic number.

It is not a de Polignac number, because 72559999 - 2¹³ = 72551807 is a prime.

It is a Duffinian number.

72559999 is a modest number, since divided by 9999 gives 7255 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72559909) 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, 459162 + ... + 459319.

It is an arithmetic number, because the mean of its divisors is an integer number (18369640).

Almost surely, 2^72559999 is an apocalyptic number.

72559999 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

72559999 is a deficient number, since it is larger than the sum of its proper divisors (918561).

72559999 is an equidigital number, since it uses as much as digits as its factorization.

72559999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918560.

The product of its digits is 2296350, while the sum is 55.

The square root of 72559999 is about 8518.2157169210. The cubic root of 72559999 is about 417.0925404252.

Subtracting 72559999 from its reverse (99995527), we obtain a triangular number (27435528 = T₇₄₀₇).

The spelling of 72559999 in words is "seventy-two million, five hundred fifty-nine thousand, nine hundred ninety-nine".