72212040 has 64 divisors (see below), whose sum is σ = 240710400. Its totient is φ = 19256256.

The previous prime is 72212011. The next prime is 72212087. The reversal of 72212040 is 4021227.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 32352 + ... + 34511.

It is an arithmetic number, because the mean of its divisors is an integer number (3761100).

Almost surely, 2^72212040 is an apocalyptic number.

It is an amenable number.

72212040 is an abundant number, since it is smaller than the sum of its proper divisors (168498360).

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

72212040 is a wasteful number, since it uses less digits than its factorization.

72212040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66883 (or 66873 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 72212040 is about 8497.7667654508. The cubic root of 72212040 is about 416.4247541530.

Adding to 72212040 its reverse (4021227), we get a palindrome (76233267).

It can be divided in two parts, 7221 and 2040, that added together give a cube (9261 = 21³).

The spelling of 72212040 in words is "seventy-two million, two hundred twelve thousand, forty".