72619891 has 2 divisors, whose sum is σ = 72619892. Its totient is φ = 72619890.

The previous prime is 72619873. The next prime is 72619931. The reversal of 72619891 is 19891627.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72619891 - 2¹¹ = 72617843 is a prime.

It is a zygodrome in base 6.

It is not a weakly prime, because it can be changed into another prime (72619861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36309945 + 36309946.

It is an arithmetic number, because the mean of its divisors is an integer number (36309946).

Almost surely, 2^72619891 is an apocalyptic number.

72619891 is a deficient number, since it is larger than the sum of its proper divisors (1).

72619891 is an equidigital number, since it uses as much as digits as its factorization.

72619891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 43.

The square root of 72619891 is about 8521.7305167437. The cubic root of 72619891 is about 417.2072667980.

The spelling of 72619891 in words is "seventy-two million, six hundred nineteen thousand, eight hundred ninety-one".