71979490 has 32 divisors (see below), whose sum is σ = 142736256. Its totient is φ = 25916160.

The previous prime is 71979473. The next prime is 71979491. The reversal of 71979490 is 9497917.

It is a self number, because there is not a number n which added to its sum of digits gives 71979490.

It is not an unprimeable number, because it can be changed into a prime (71979491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8154 + ... + 14506.

It is an arithmetic number, because the mean of its divisors is an integer number (4460508).

Almost surely, 2^71979490 is an apocalyptic number.

71979490 is a deficient number, since it is larger than the sum of its proper divisors (70756766).

71979490 is a wasteful number, since it uses less digits than its factorization.

71979490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6474.

The product of its (nonzero) digits is 142884, while the sum is 46.

The square root of 71979490 is about 8484.0727248180. The cubic root of 71979490 is about 415.9772585263.

The spelling of 71979490 in words is "seventy-one million, nine hundred seventy-nine thousand, four hundred ninety".