778680038 has 4 divisors (see below), whose sum is σ = 1168020060. Its totient is φ = 389340018.

The previous prime is 778680037. The next prime is 778680079. The reversal of 778680038 is 830086877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 830086877 = 19 ⋅43688783.

It is a junction number, because it is equal to n+sod(n) for n = 778679974 and 778680001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778680037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194670008 + ... + 194670011.

It is an arithmetic number, because the mean of its divisors is an integer number (292005015).

Almost surely, 2^778680038 is an apocalyptic number.

778680038 is a deficient number, since it is larger than the sum of its proper divisors (389340022).

778680038 is a wasteful number, since it uses less digits than its factorization.

778680038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389340021.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 778680038 is about 27904.8389710459. The cubic root of 778680038 is about 919.9968643560.

The spelling of 778680038 in words is "seven hundred seventy-eight million, six hundred eighty thousand, thirty-eight".