76971987 has 6 divisors (see below), whose sum is σ = 111181772. Its totient is φ = 51314652.

The previous prime is 76971949. The next prime is 76971989. The reversal of 76971987 is 78917967.

It is not a de Polignac number, because 76971987 - 2¹⁶ = 76906451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76971989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4276213 + ... + 4276230.

Almost surely, 2^76971987 is an apocalyptic number.

76971987 is a deficient number, since it is larger than the sum of its proper divisors (34209785).

76971987 is a wasteful number, since it uses less digits than its factorization.

76971987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8552449 (or 8552446 counting only the distinct ones).

The product of its digits is 1333584, while the sum is 54.

The square root of 76971987 is about 8773.3680533761. The cubic root of 76971987 is about 425.3804887861.

The spelling of 76971987 in words is "seventy-six million, nine hundred seventy-one thousand, nine hundred eighty-seven".