72840945 has 8 divisors (see below), whose sum is σ = 116545536. Its totient is φ = 38848496.

The previous prime is 72840941. The next prime is 72840949. The reversal of 72840945 is 54904827.

It is an interprime number because it is at equal distance from previous prime (72840941) and next prime (72840949).

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

It is a cyclic number.

It is not a de Polignac number, because 72840945 - 2² = 72840941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72840941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2428017 + ... + 2428046.

It is an arithmetic number, because the mean of its divisors is an integer number (14568192).

Almost surely, 2^72840945 is an apocalyptic number.

It is an amenable number.

72840945 is a deficient number, since it is larger than the sum of its proper divisors (43704591).

72840945 is a wasteful number, since it uses less digits than its factorization.

72840945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4856071.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 72840945 is about 8534.6906798079. The cubic root of 72840945 is about 417.6301624824.

The spelling of 72840945 in words is "seventy-two million, eight hundred forty thousand, nine hundred forty-five".