76728401 has 2 divisors, whose sum is σ = 76728402. Its totient is φ = 76728400.

The previous prime is 76728397. The next prime is 76728427. The reversal of 76728401 is 10482767.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49688401 + 27040000 = 7049^2 + 5200^2 .

It is an emirp because it is prime and its reverse (10482767) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76728401 - 2² = 76728397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (76728451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38364200 + 38364201.

It is an arithmetic number, because the mean of its divisors is an integer number (38364201).

Almost surely, 2^76728401 is an apocalyptic number.

It is an amenable number.

76728401 is a deficient number, since it is larger than the sum of its proper divisors (1).

76728401 is an equidigital number, since it uses as much as digits as its factorization.

76728401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 76728401 is about 8759.4749271860. The cubic root of 76728401 is about 424.9312940838.

The spelling of 76728401 in words is "seventy-six million, seven hundred twenty-eight thousand, four hundred one".