71989755 has 8 divisors (see below), whose sum is σ = 115183632. Its totient is φ = 38394528.

The previous prime is 71989751. The next prime is 71989763. The reversal of 71989755 is 55798917.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71989755 - 2² = 71989751 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71989698 and 71989707.

It is not an unprimeable number, because it can be changed into a prime (71989751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2399644 + ... + 2399673.

It is an arithmetic number, because the mean of its divisors is an integer number (14397954).

Almost surely, 2^71989755 is an apocalyptic number.

71989755 is a deficient number, since it is larger than the sum of its proper divisors (43193877).

71989755 is a wasteful number, since it uses less digits than its factorization.

71989755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4799325.

The product of its digits is 793800, while the sum is 51.

The square root of 71989755 is about 8484.6776603475. The cubic root of 71989755 is about 415.9970317681.

The spelling of 71989755 in words is "seventy-one million, nine hundred eighty-nine thousand, seven hundred fifty-five".