71649889 has 4 divisors (see below), whose sum is σ = 71781424. Its totient is φ = 71518356.

The previous prime is 71649857. The next prime is 71649901. The reversal of 71649889 is 98894617.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98894617 = 2551 ⋅38767.

It is a cyclic number.

It is not a de Polignac number, because 71649889 - 2⁵ = 71649857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71649829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64947 + ... + 66040.

It is an arithmetic number, because the mean of its divisors is an integer number (17945356).

Almost surely, 2^71649889 is an apocalyptic number.

It is an amenable number.

71649889 is a deficient number, since it is larger than the sum of its proper divisors (131535).

71649889 is a wasteful number, since it uses less digits than its factorization.

71649889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131534.

The product of its digits is 870912, while the sum is 52.

The square root of 71649889 is about 8464.6257448277. The cubic root of 71649889 is about 415.3413536361.

It can be divided in two parts, 716 and 49889, that added together give a palindrome (50605).

The spelling of 71649889 in words is "seventy-one million, six hundred forty-nine thousand, eight hundred eighty-nine".