77813426 has 4 divisors (see below), whose sum is σ = 116720142. Its totient is φ = 38906712.

The previous prime is 77813399. The next prime is 77813431. The reversal of 77813426 is 62431877.

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

It can be written as a sum of positive squares in only one way, i.e., 51854401 + 25959025 = 7201^2 + 5095^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 77813426.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 19453355 + ... + 19453358.

Almost surely, 2^77813426 is an apocalyptic number.

77813426 is a deficient number, since it is larger than the sum of its proper divisors (38906716).

77813426 is a wasteful number, since it uses less digits than its factorization.

77813426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38906715.

The product of its digits is 56448, while the sum is 38.

The square root of 77813426 is about 8821.1918695832. The cubic root of 77813426 is about 426.9249265168.

The spelling of 77813426 in words is "seventy-seven million, eight hundred thirteen thousand, four hundred twenty-six".