76987561 has 8 divisors (see below), whose sum is σ = 88629120. Its totient is φ = 65506848.

The previous prime is 76987541. The next prime is 76987567. The reversal of 76987561 is 16578967.

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

It is a cyclic number.

It is not a de Polignac number, because 76987561 - 2⁵ = 76987529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76987567) 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, 39181 + ... + 41098.

It is an arithmetic number, because the mean of its divisors is an integer number (11078640).

Almost surely, 2^76987561 is an apocalyptic number.

It is an amenable number.

76987561 is a deficient number, since it is larger than the sum of its proper divisors (11641559).

76987561 is a wasteful number, since it uses less digits than its factorization.

76987561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80423.

The product of its digits is 635040, while the sum is 49.

The square root of 76987561 is about 8774.2555809596. The cubic root of 76987561 is about 425.4091764045.

The spelling of 76987561 in words is "seventy-six million, nine hundred eighty-seven thousand, five hundred sixty-one".