72019755 has 24 divisors (see below), whose sum is σ = 125545680. Its totient is φ = 38191680.

The previous prime is 72019751. The next prime is 72019777. The reversal of 72019755 is 55791027.

It is not a de Polignac number, because 72019755 - 2² = 72019751 is a prime.

It is a super-2 number, since 2×72019755² = 10373690220520050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72019751) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3585 + ... + 12525.

It is an arithmetic number, because the mean of its divisors is an integer number (5231070).

Almost surely, 2^72019755 is an apocalyptic number.

72019755 is a deficient number, since it is larger than the sum of its proper divisors (53525925).

72019755 is a wasteful number, since it uses less digits than its factorization.

72019755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9131 (or 9128 counting only the distinct ones).

The product of its (nonzero) digits is 22050, while the sum is 36.

The square root of 72019755 is about 8486.4453689398. The cubic root of 72019755 is about 416.0548093310.

The spelling of 72019755 in words is "seventy-two million, nineteen thousand, seven hundred fifty-five".