72920963 has 4 divisors (see below), whose sum is σ = 73287600. Its totient is φ = 72554328.

The previous prime is 72920933. The next prime is 72920983. The reversal of 72920963 is 36902927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36902927 = 31 ⋅1190417.

It is a cyclic number.

It is not a de Polignac number, because 72920963 - 2⁶ = 72920899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72920933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183020 + ... + 183417.

It is an arithmetic number, because the mean of its divisors is an integer number (18321900).

Almost surely, 2^72920963 is an apocalyptic number.

72920963 is a deficient number, since it is larger than the sum of its proper divisors (366637).

72920963 is a wasteful number, since it uses less digits than its factorization.

72920963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366636.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 72920963 is about 8539.3772021149. The cubic root of 72920963 is about 417.7830330093.

The spelling of 72920963 in words is "seventy-two million, nine hundred twenty thousand, nine hundred sixty-three".