78381258 has 32 divisors (see below), whose sum is σ = 166138560. Its totient is φ = 24608640.

The previous prime is 78381253. The next prime is 78381269. The reversal of 78381258 is 85218387.

It is a happy number.

It is a super-2 number, since 2×78381258² = 12287243211325128, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (78381253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1641 + ... + 12627.

It is an arithmetic number, because the mean of its divisors is an integer number (5191830).

Almost surely, 2^78381258 is an apocalyptic number.

78381258 is an abundant number, since it is smaller than the sum of its proper divisors (87757302).

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

78381258 is a wasteful number, since it uses less digits than its factorization.

78381258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11062.

The product of its digits is 107520, while the sum is 42.

The square root of 78381258 is about 8853.3190386431. The cubic root of 78381258 is about 427.9608845669.

The spelling of 78381258 in words is "seventy-eight million, three hundred eighty-one thousand, two hundred fifty-eight".