72061819 has 2 divisors, whose sum is σ = 72061820. Its totient is φ = 72061818.

The previous prime is 72061757. The next prime is 72061823. The reversal of 72061819 is 91816027.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72061819 is a prime.

It is a super-2 number, since 2×72061819² = 10385811515177522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72061879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36030909 + 36030910.

It is an arithmetic number, because the mean of its divisors is an integer number (36030910).

Almost surely, 2^72061819 is an apocalyptic number.

72061819 is a deficient number, since it is larger than the sum of its proper divisors (1).

72061819 is an equidigital number, since it uses as much as digits as its factorization.

72061819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 72061819 is about 8488.9233121757. The cubic root of 72061819 is about 416.1357941636.

It can be divided in two parts, 7206 and 1819, that added together give a square (9025 = 95²).

The spelling of 72061819 in words is "seventy-two million, sixty-one thousand, eight hundred nineteen".