72278913 has 16 divisors (see below), whose sum is σ = 110315520. Its totient is φ = 41236176.

The previous prime is 72278897. The next prime is 72278957. The reversal of 72278913 is 31987227.

It is not a de Polignac number, because 72278913 - 2⁴ = 72278897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72278993) 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, 12706 + ... + 17492.

It is an arithmetic number, because the mean of its divisors is an integer number (6894720).

Almost surely, 2^72278913 is an apocalyptic number.

It is an amenable number.

72278913 is a deficient number, since it is larger than the sum of its proper divisors (38036607).

72278913 is a wasteful number, since it uses less digits than its factorization.

72278913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5516.

The product of its digits is 42336, while the sum is 39.

The square root of 72278913 is about 8501.7005945869. The cubic root of 72278913 is about 416.5532598739.

The spelling of 72278913 in words is "seventy-two million, two hundred seventy-eight thousand, nine hundred thirteen".