78408884 has 6 divisors (see below), whose sum is σ = 137215554. Its totient is φ = 39204440.

The previous prime is 78408857. The next prime is 78408887. The reversal of 78408884 is 48880487.

It can be written as a sum of positive squares in only one way, i.e., 73444900 + 4963984 = 8570^2 + 2228^2 .

It is a super-2 number, since 2×78408884² = 12295906180250912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78408887) 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 as a sum of consecutive naturals, namely, 9801107 + ... + 9801114.

It is an arithmetic number, because the mean of its divisors is an integer number (22869259).

Almost surely, 2^78408884 is an apocalyptic number.

It is an amenable number.

78408884 is a deficient number, since it is larger than the sum of its proper divisors (58806670).

78408884 is a wasteful number, since it uses less digits than its factorization.

78408884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19602225 (or 19602223 counting only the distinct ones).

The product of its (nonzero) digits is 458752, while the sum is 47.

The square root of 78408884 is about 8854.8791070234. The cubic root of 78408884 is about 428.0111578889.

The spelling of 78408884 in words is "seventy-eight million, four hundred eight thousand, eight hundred eighty-four".