71949789 has 20 divisors (see below), whose sum is σ = 113139840. Its totient is φ = 45441000.

The previous prime is 71949781. The next prime is 71949817. The reversal of 71949789 is 98794917.

71949789 is a `hidden beast` number, since 71 + 9 + 497 + 89 = 666.

It is not a de Polignac number, because 71949789 - 2³ = 71949781 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71949781) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21837 + ... + 24914.

It is an arithmetic number, because the mean of its divisors is an integer number (5656992).

Almost surely, 2^71949789 is an apocalyptic number.

It is an amenable number.

71949789 is a deficient number, since it is larger than the sum of its proper divisors (41190051).

71949789 is a wasteful number, since it uses less digits than its factorization.

71949789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46782 (or 46773 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 71949789 is about 8482.3221466766. The cubic root of 71949789 is about 415.9200355577.

The spelling of 71949789 in words is "seventy-one million, nine hundred forty-nine thousand, seven hundred eighty-nine".