72261138 has 16 divisors (see below), whose sum is σ = 144619776. Its totient is φ = 24070800.

The previous prime is 72261121. The next prime is 72261151. The reversal of 72261138 is 83116227.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8620 + ... + 14792.

It is an arithmetic number, because the mean of its divisors is an integer number (9038736).

Almost surely, 2^72261138 is an apocalyptic number.

72261138 is an abundant number, since it is smaller than the sum of its proper divisors (72358638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72261138 is a wasteful number, since it uses less digits than its factorization.

72261138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8129.

The product of its digits is 4032, while the sum is 30.

The square root of 72261138 is about 8500.6551512222. The cubic root of 72261138 is about 416.5191104892.

The spelling of 72261138 in words is "seventy-two million, two hundred sixty-one thousand, one hundred thirty-eight".