72619817 has 4 divisors (see below), whose sum is σ = 73435860. Its totient is φ = 71803776.

The previous prime is 72619787. The next prime is 72619849. The reversal of 72619817 is 71891627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71891627 = 353 ⋅203659.

It can be written as a sum of positive squares in 2 ways, for example, as 33918976 + 38700841 = 5824^2 + 6221^2 .

It is a de Polignac number, because none of the positive numbers 2^k-72619817 is a prime.

It is a super-2 number, since 2×72619817² = 10547275642226978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72619517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 407888 + ... + 408065.

It is an arithmetic number, because the mean of its divisors is an integer number (18358965).

Almost surely, 2^72619817 is an apocalyptic number.

It is an amenable number.

72619817 is a deficient number, since it is larger than the sum of its proper divisors (816043).

72619817 is an equidigital number, since it uses as much as digits as its factorization.

72619817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816042.

The product of its digits is 42336, while the sum is 41.

The square root of 72619817 is about 8521.7261749014. The cubic root of 72619817 is about 417.2071250859.

The spelling of 72619817 in words is "seventy-two million, six hundred nineteen thousand, eight hundred seventeen".