76399649 has 4 divisors (see below), whose sum is σ = 80893764. Its totient is φ = 71905536.

The previous prime is 76399643. The next prime is 76399669. The reversal of 76399649 is 94699367.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69472225 + 6927424 = 8335^2 + 2632^2 .

It is a cyclic number.

It is not a de Polignac number, because 76399649 - 2¹⁶ = 76334113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 76399649.

It is not an unprimeable number, because it can be changed into a prime (76399643) 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, 2247032 + ... + 2247065.

It is an arithmetic number, because the mean of its divisors is an integer number (20223441).

Almost surely, 2^76399649 is an apocalyptic number.

It is an amenable number.

76399649 is a deficient number, since it is larger than the sum of its proper divisors (4494115).

76399649 is a wasteful number, since it uses less digits than its factorization.

76399649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4494114.

The product of its digits is 2204496, while the sum is 53.

The square root of 76399649 is about 8740.6892748799. The cubic root of 76399649 is about 424.3235356205.

The spelling of 76399649 in words is "seventy-six million, three hundred ninety-nine thousand, six hundred forty-nine".