78388570 has 64 divisors (see below), whose sum is σ = 160110720. Its totient is φ = 27433728.

The previous prime is 78388543. The next prime is 78388571. The reversal of 78388570 is 7588387.

It is a super-2 number, since 2×78388570² = 12289535813289800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78388570.

It is not an unprimeable number, because it can be changed into a prime (78388571) 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 31 ways as a sum of consecutive naturals, for example, 206641 + ... + 207019.

It is an arithmetic number, because the mean of its divisors is an integer number (2501730).

Almost surely, 2^78388570 is an apocalyptic number.

78388570 is an abundant number, since it is smaller than the sum of its proper divisors (81722150).

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

78388570 is a wasteful number, since it uses less digits than its factorization.

78388570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479.

The product of its (nonzero) digits is 376320, while the sum is 46.

The square root of 78388570 is about 8853.7319814867. The cubic root of 78388570 is about 427.9741919687.

The spelling of 78388570 in words is "seventy-eight million, three hundred eighty-eight thousand, five hundred seventy".