78784740 has 36 divisors (see below), whose sum is σ = 238980924. Its totient is φ = 21009216.

The previous prime is 78784721. The next prime is 78784753. The reversal of 78784740 is 4748787.

It can be written as a sum of positive squares in 2 ways, for example, as 30008484 + 48776256 = 5478^2 + 6984^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 218667 + ... + 219026.

It is an arithmetic number, because the mean of its divisors is an integer number (6638359).

Almost surely, 2^78784740 is an apocalyptic number.

It is an amenable number.

78784740 is an abundant number, since it is smaller than the sum of its proper divisors (160196184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78784740 is a wasteful number, since it uses less digits than its factorization.

78784740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437708 (or 437703 counting only the distinct ones).

The product of its (nonzero) digits is 351232, while the sum is 45.

The square root of 78784740 is about 8876.0768360802. The cubic root of 78784740 is about 428.6939640094.

It can be divided in two parts, 78784 and 740, that added together give a square (79524 = 282²).

The spelling of 78784740 in words is "seventy-eight million, seven hundred eighty-four thousand, seven hundred forty".