78253386 has 32 divisors (see below), whose sum is σ = 159364800. Its totient is φ = 25612800.

The previous prime is 78253369. The next prime is 78253391. The reversal of 78253386 is 68335287.

It is a super-2 number, since 2×78253386² = 12247184840929992, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 83770 + ... + 84698.

It is an arithmetic number, because the mean of its divisors is an integer number (4980150).

Almost surely, 2^78253386 is an apocalyptic number.

78253386 is an abundant number, since it is smaller than the sum of its proper divisors (81111414).

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

78253386 is a wasteful number, since it uses less digits than its factorization.

78253386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174.

The product of its digits is 241920, while the sum is 42.

The square root of 78253386 is about 8846.0943924424. The cubic root of 78253386 is about 427.7280312810.

It can be divided in two parts, 7825 and 3386, that added together give a palindrome (11211).

The spelling of 78253386 in words is "seventy-eight million, two hundred fifty-three thousand, three hundred eighty-six".