72380505 has 16 divisors (see below), whose sum is σ = 119545344. Its totient is φ = 37357440.

The previous prime is 72380467. The next prime is 72380507. The reversal of 72380505 is 50508327.

It is a happy number.

It is not a de Polignac number, because 72380505 - 2⁸ = 72380249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72380507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77364 + ... + 78293.

It is an arithmetic number, because the mean of its divisors is an integer number (7471584).

Almost surely, 2^72380505 is an apocalyptic number.

It is an amenable number.

72380505 is a deficient number, since it is larger than the sum of its proper divisors (47164839).

72380505 is a wasteful number, since it uses less digits than its factorization.

72380505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155696.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 72380505 is about 8507.6733012029. The cubic root of 72380505 is about 416.7483313708.

The spelling of 72380505 in words is "seventy-two million, three hundred eighty thousand, five hundred five".