763978 has 4 divisors (see below), whose sum is σ = 1145970. Its totient is φ = 381988.

The previous prime is 763967. The next prime is 763999. The reversal of 763978 is 879367.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 879367 = 29 ⋅30323.

It can be written as a sum of positive squares in only one way, i.e., 762129 + 1849 = 873^2 + 43^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 763978.

It is an unprimeable number.

763978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190993 + ... + 190996.

2⁷⁶³⁹⁷⁸ is an apocalyptic number.

763978 is a deficient number, since it is larger than the sum of its proper divisors (381992).

763978 is a wasteful number, since it uses less digits than its factorization.

763978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381991.

The product of its digits is 63504, while the sum is 40.

The square root of 763978 is about 874.0583504549. The cubic root of 763978 is about 91.4169970002.

The spelling of 763978 in words is "seven hundred sixty-three thousand, nine hundred seventy-eight".