76561989 has 8 divisors (see below), whose sum is σ = 116665920. Its totient is φ = 43749696.

The previous prime is 76561987. The next prime is 76561993. The reversal of 76561989 is 98916567.

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

It is not a de Polignac number, because 76561989 - 2¹ = 76561987 is a prime.

It is a super-2 number, since 2×76561989² = 11723476319272242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76561987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1822884 + ... + 1822925.

It is an arithmetic number, because the mean of its divisors is an integer number (14583240).

Almost surely, 2^76561989 is an apocalyptic number.

It is an amenable number.

76561989 is a deficient number, since it is larger than the sum of its proper divisors (40103931).

76561989 is a wasteful number, since it uses less digits than its factorization.

76561989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3645819.

The product of its digits is 816480, while the sum is 51.

The square root of 76561989 is about 8749.9707999513. The cubic root of 76561989 is about 424.6238683692.

The spelling of 76561989 in words is "seventy-six million, five hundred sixty-one thousand, nine hundred eighty-nine".