76636489 has 4 divisors (see below), whose sum is σ = 76713156. Its totient is φ = 76559824.

The previous prime is 76636471. The next prime is 76636507. The reversal of 76636489 is 98463667.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (76636471) and next prime (76636507).

It can be written as a sum of positive squares in 2 ways, for example, as 14100025 + 62536464 = 3755^2 + 7908^2 .

It is a cyclic number.

It is not a de Polignac number, because 76636489 - 2¹³ = 76628297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76616489) 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, 36814 + ... + 38839.

It is an arithmetic number, because the mean of its divisors is an integer number (19178289).

Almost surely, 2^76636489 is an apocalyptic number.

It is an amenable number.

76636489 is a deficient number, since it is larger than the sum of its proper divisors (76667).

76636489 is a wasteful number, since it uses less digits than its factorization.

76636489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76666.

The product of its digits is 1306368, while the sum is 49.

The square root of 76636489 is about 8754.2269218932. The cubic root of 76636489 is about 424.7615529798.

The spelling of 76636489 in words is "seventy-six million, six hundred thirty-six thousand, four hundred eighty-nine".