72420005 has 16 divisors (see below), whose sum is σ = 100203264. Its totient is φ = 49217280.

The previous prime is 72419959. The next prime is 72420013. The reversal of 72420005 is 50002427.

It is not a de Polignac number, because 72420005 - 2¹⁰ = 72418981 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5201 + ... + 13110.

It is an arithmetic number, because the mean of its divisors is an integer number (6262704).

Almost surely, 2^72420005 is an apocalyptic number.

It is an amenable number.

72420005 is a deficient number, since it is larger than the sum of its proper divisors (27783259).

72420005 is a wasteful number, since it uses less digits than its factorization.

72420005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18436.

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 72420005 is about 8509.9944183295. The cubic root of 72420005 is about 416.8241278646.

The spelling of 72420005 in words is "seventy-two million, four hundred twenty thousand, five".