72090605 has 8 divisors (see below), whose sum is σ = 86557464. Its totient is φ = 57640000.

The previous prime is 72090589. The next prime is 72090611. The reversal of 72090605 is 50609027.

It can be written as a sum of positive squares in 4 ways, for example, as 38763076 + 33327529 = 6226^2 + 5773^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72090605 - 2⁴ = 72090589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10355 + ... + 15855.

It is an arithmetic number, because the mean of its divisors is an integer number (10819683).

Almost surely, 2^72090605 is an apocalyptic number.

It is an amenable number.

72090605 is a deficient number, since it is larger than the sum of its proper divisors (14466859).

72090605 is a wasteful number, since it uses less digits than its factorization.

72090605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8127.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 72090605 is about 8490.6186464827. The cubic root of 72090605 is about 416.1911970128.

The spelling of 72090605 in words is "seventy-two million, ninety thousand, six hundred five".