76478721 has 16 divisors (see below), whose sum is σ = 111464640. Its totient is φ = 46257920.

The previous prime is 76478719. The next prime is 76478723. The reversal of 76478721 is 12787467.

It is an interprime number because it is at equal distance from previous prime (76478719) and next prime (76478723).

It is a cyclic number.

It is not a de Polignac number, because 76478721 - 2¹ = 76478719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (76478723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16741 + ... + 20813.

It is an arithmetic number, because the mean of its divisors is an integer number (6966540).

Almost surely, 2^76478721 is an apocalyptic number.

It is an amenable number.

76478721 is a deficient number, since it is larger than the sum of its proper divisors (34985919).

76478721 is a wasteful number, since it uses less digits than its factorization.

76478721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4656.

The product of its digits is 131712, while the sum is 42.

The square root of 76478721 is about 8745.2113182015. The cubic root of 76478721 is about 424.4698737362.

The spelling of 76478721 in words is "seventy-six million, four hundred seventy-eight thousand, seven hundred twenty-one".