78403663 has 12 divisors (see below), whose sum is σ = 86881080. Its totient is φ = 70682976.

The previous prime is 78403627. The next prime is 78403673. The reversal of 78403663 is 36630487.

It is a happy number.

It is not a de Polignac number, because 78403663 - 2¹⁷ = 78272591 is a prime.

It is a super-2 number, since 2×78403663² = 12294268743635138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78403673) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 1873 + ... + 12661.

It is an arithmetic number, because the mean of its divisors is an integer number (7240090).

Almost surely, 2^78403663 is an apocalyptic number.

78403663 is a deficient number, since it is larger than the sum of its proper divisors (8477417).

78403663 is a wasteful number, since it uses less digits than its factorization.

78403663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10858 (or 10845 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 78403663 is about 8854.5842928960. The cubic root of 78403663 is about 428.0016577075.

The spelling of 78403663 in words is "seventy-eight million, four hundred three thousand, six hundred sixty-three".