76721749 has 8 divisors (see below), whose sum is σ = 82796000. Its totient is φ = 70672176.

The previous prime is 76721693. The next prime is 76721779. The reversal of 76721749 is 94712767.

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 76721749 - 2¹³ = 76713557 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 (76721779) 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 7 ways as a sum of consecutive naturals, for example, 574 + ... + 12400.

It is an arithmetic number, because the mean of its divisors is an integer number (10349500).

Almost surely, 2^76721749 is an apocalyptic number.

It is an amenable number.

76721749 is a deficient number, since it is larger than the sum of its proper divisors (6074251).

76721749 is a wasteful number, since it uses less digits than its factorization.

76721749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12339.

The product of its digits is 148176, while the sum is 43.

The square root of 76721749 is about 8759.0952158314. The cubic root of 76721749 is about 424.9190138650.

The spelling of 76721749 in words is "seventy-six million, seven hundred twenty-one thousand, seven hundred forty-nine".