76421917 has 16 divisors (see below), whose sum is σ = 90038592. Its totient is φ = 63947520.

The previous prime is 76421899. The next prime is 76421921. The reversal of 76421917 is 71912467.

It is a de Polignac number, because none of the positive numbers 2^k-76421917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76421927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77733 + ... + 78709.

It is an arithmetic number, because the mean of its divisors is an integer number (5627412).

Almost surely, 2^76421917 is an apocalyptic number.

It is an amenable number.

76421917 is a deficient number, since it is larger than the sum of its proper divisors (13616675).

76421917 is a wasteful number, since it uses less digits than its factorization.

76421917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548.

The product of its digits is 21168, while the sum is 37.

The square root of 76421917 is about 8741.9629946597. The cubic root of 76421917 is about 424.3647570954.

It can be divided in two parts, 7642 and 1917, that added together give a palindrome (9559).

The spelling of 76421917 in words is "seventy-six million, four hundred twenty-one thousand, nine hundred seventeen".