71990073 has 16 divisors (see below), whose sum is σ = 107712000. Its totient is φ = 47516400.

The previous prime is 71990071. The next prime is 71990081. The reversal of 71990073 is 37009917.

It is not a de Polignac number, because 71990073 - 2¹ = 71990071 is a prime.

It is a super-2 number, since 2×71990073² = 10365141221090658, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71990071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10473 + ... + 15926.

It is an arithmetic number, because the mean of its divisors is an integer number (6732000).

Almost surely, 2^71990073 is an apocalyptic number.

It is an amenable number.

71990073 is a deficient number, since it is larger than the sum of its proper divisors (35721927).

71990073 is a wasteful number, since it uses less digits than its factorization.

71990073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26509 (or 26503 counting only the distinct ones).

The product of its (nonzero) digits is 11907, while the sum is 36.

The square root of 71990073 is about 8484.6963999898. The cubic root of 71990073 is about 415.9976442945.

The spelling of 71990073 in words is "seventy-one million, nine hundred ninety thousand, seventy-three".