72293905 has 4 divisors (see below), whose sum is σ = 86752692. Its totient is φ = 57835120.

The previous prime is 72293873. The next prime is 72293951. The reversal of 72293905 is 50939227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50939227 = 23 ⋅2214749.

It can be written as a sum of positive squares in 2 ways, for example, as 10969344 + 61324561 = 3312^2 + 7831^2 .

It is not a de Polignac number, because 72293905 - 2⁵ = 72293873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7229386 + ... + 7229395.

It is an arithmetic number, because the mean of its divisors is an integer number (21688173).

Almost surely, 2^72293905 is an apocalyptic number.

It is an amenable number.

72293905 is a deficient number, since it is larger than the sum of its proper divisors (14458787).

72293905 is a wasteful number, since it uses less digits than its factorization.

72293905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14458786.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 72293905 is about 8502.5822548212. The cubic root of 72293905 is about 416.5820581983.

The spelling of 72293905 in words is "seventy-two million, two hundred ninety-three thousand, nine hundred five".