72011970 has 32 divisors (see below), whose sum is σ = 192032640. Its totient is φ = 19203120.

The previous prime is 72011923. The next prime is 72011987. The reversal of 72011970 is 7911027.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133086 + ... + 133625.

It is an arithmetic number, because the mean of its divisors is an integer number (6001020).

Almost surely, 2^72011970 is an apocalyptic number.

72011970 is an abundant number, since it is smaller than the sum of its proper divisors (120020670).

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

72011970 is a wasteful number, since it uses less digits than its factorization.

72011970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266727 (or 266721 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 27.

The square root of 72011970 is about 8485.9866839396. The cubic root of 72011970 is about 416.0398175953.

Adding to 72011970 its reverse (7911027), we get a palindrome (79922997).

The spelling of 72011970 in words is "seventy-two million, eleven thousand, nine hundred seventy".