72420089 has 6 divisors (see below), whose sum is σ = 84243834. Its totient is φ = 62074320.

The previous prime is 72420067. The next prime is 72420097. The reversal of 72420089 is 98002427.

It can be written as a sum of positive squares in only one way, i.e., 37515625 + 34904464 = 6125^2 + 5908^2 .

It is not a de Polignac number, because 72420089 - 2⁸ = 72419833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72420389) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 738932 + ... + 739029.

It is an arithmetic number, because the mean of its divisors is an integer number (14040639).

Almost surely, 2^72420089 is an apocalyptic number.

It is an amenable number.

72420089 is a deficient number, since it is larger than the sum of its proper divisors (11823745).

72420089 is a wasteful number, since it uses less digits than its factorization.

72420089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477975 (or 1477968 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 72420089 is about 8509.9993537015. Note that the first 3 decimals coincide. The cubic root of 72420089 is about 416.8242890227.

The spelling of 72420089 in words is "seventy-two million, four hundred twenty thousand, eighty-nine".