76421749 has 4 divisors (see below), whose sum is σ = 80917164. Its totient is φ = 71926336.

The previous prime is 76421747. The next prime is 76421759. The reversal of 76421749 is 94712467.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94712467 = 257 ⋅368531.

It can be written as a sum of positive squares in 2 ways, for example, as 62694724 + 13727025 = 7918^2 + 3705^2 .

It is a cyclic number.

It is not a de Polignac number, because 76421749 - 2¹ = 76421747 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 (76421747) 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 3 ways as a sum of consecutive naturals, for example, 2247682 + ... + 2247715.

It is an arithmetic number, because the mean of its divisors is an integer number (20229291).

Almost surely, 2^76421749 is an apocalyptic number.

It is an amenable number.

76421749 is a deficient number, since it is larger than the sum of its proper divisors (4495415).

76421749 is a wasteful number, since it uses less digits than its factorization.

76421749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4495414.

The product of its digits is 84672, while the sum is 40.

The square root of 76421749 is about 8741.9533858286. The cubic root of 76421749 is about 424.3644461317.

The spelling of 76421749 in words is "seventy-six million, four hundred twenty-one thousand, seven hundred forty-nine".