78400763 has 4 divisors (see below), whose sum is σ = 89600880. Its totient is φ = 67200648.

The previous prime is 78400741. The next prime is 78400769. The reversal of 78400763 is 36700487.

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

It is a cyclic number.

It is not a de Polignac number, because 78400763 - 2¹⁴ = 78384379 is a prime.

It is a super-2 number, since 2×78400763² = 12293359277964338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78400769) 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, 5600048 + ... + 5600061.

It is an arithmetic number, because the mean of its divisors is an integer number (22400220).

Almost surely, 2^78400763 is an apocalyptic number.

78400763 is a deficient number, since it is larger than the sum of its proper divisors (11200117).

78400763 is a wasteful number, since it uses less digits than its factorization.

78400763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11200116.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 78400763 is about 8854.4205343998. The cubic root of 78400763 is about 427.9963806577.

The spelling of 78400763 in words is "seventy-eight million, four hundred thousand, seven hundred sixty-three".