71998930 has 16 divisors (see below), whose sum is σ = 129708864. Its totient is φ = 28774960.

The previous prime is 71998921. The next prime is 71998933. The reversal of 71998930 is 3989917.

It is a super-2 number, since 2×71998930² = 10367691842289800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71998933) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 13419 + ... + 18001.

It is an arithmetic number, because the mean of its divisors is an integer number (8106804).

Almost surely, 2^71998930 is an apocalyptic number.

71998930 is a deficient number, since it is larger than the sum of its proper divisors (57709934).

71998930 is a wasteful number, since it uses less digits than its factorization.

71998930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6161.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 71998930 is about 8485.2183236497. The cubic root of 71998930 is about 416.0147037764.

It can be divided in two parts, 7199 and 8930, that added together give a square (16129 = 127²).

The spelling of 71998930 in words is "seventy-one million, nine hundred ninety-eight thousand, nine hundred thirty".