76417721 has 4 divisors (see below), whose sum is σ = 77558352. Its totient is φ = 75277092.

The previous prime is 76417717. The next prime is 76417739. The reversal of 76417721 is 12771467.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12771467 = 907 ⋅14081.

It is a cyclic number.

It is not a de Polignac number, because 76417721 - 2² = 76417717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76417741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 570215 + ... + 570348.

It is an arithmetic number, because the mean of its divisors is an integer number (19389588).

Almost surely, 2^76417721 is an apocalyptic number.

It is an amenable number.

76417721 is a deficient number, since it is larger than the sum of its proper divisors (1140631).

76417721 is a wasteful number, since it uses less digits than its factorization.

76417721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140630.

The product of its digits is 16464, while the sum is 35.

The square root of 76417721 is about 8741.7229995007. The cubic root of 76417721 is about 424.3569902698.

The spelling of 76417721 in words is "seventy-six million, four hundred seventeen thousand, seven hundred twenty-one".