387146778 has 16 divisors (see below), whose sum is σ = 774870816. Its totient is φ = 128952720.

The previous prime is 387146761. The next prime is 387146803. The reversal of 387146778 is 877641783.

It is a self number, because there is not a number n which added to its sum of digits gives 387146778.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 15076 + ... + 31647.

It is an arithmetic number, because the mean of its divisors is an integer number (48429426).

Almost surely, 2^387146778 is an apocalyptic number.

387146778 is an abundant number, since it is smaller than the sum of its proper divisors (387724038).

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

387146778 is a wasteful number, since it uses less digits than its factorization.

387146778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48109.

The product of its digits is 1580544, while the sum is 51.

The square root of 387146778 is about 19676.0457917743. The cubic root of 387146778 is about 728.8282810422.

The spelling of 387146778 in words is "three hundred eighty-seven million, one hundred forty-six thousand, seven hundred seventy-eight".