764420078 has 4 divisors (see below), whose sum is σ = 1146630120. Its totient is φ = 382210038.

The previous prime is 764420053. The next prime is 764420081. The reversal of 764420078 is 870024467.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 870024467 = 13 ⋅66924959.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191105018 + ... + 191105021.

It is an arithmetic number, because the mean of its divisors is an integer number (286657530).

Almost surely, 2^764420078 is an apocalyptic number.

764420078 is a deficient number, since it is larger than the sum of its proper divisors (382210042).

764420078 is a wasteful number, since it uses less digits than its factorization.

764420078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382210041.

The product of its (nonzero) digits is 75264, while the sum is 38.

The square root of 764420078 is about 27648.1478222321. The cubic root of 764420078 is about 914.3462650025.

The spelling of 764420078 in words is "seven hundred sixty-four million, four hundred twenty thousand, seventy-eight".