493778890 has 32 divisors (see below), whose sum is σ = 992160576. Its totient is φ = 175378560.

The previous prime is 493778861. The next prime is 493778891. The reversal of 493778890 is 98877394.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is not an unprimeable number, because it can be changed into a prime (493778891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47467 + ... + 56926.

It is an arithmetic number, because the mean of its divisors is an integer number (31005018).

Almost surely, 2^493778890 is an apocalyptic number.

493778890 is an abundant number, since it is smaller than the sum of its proper divisors (498381686).

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

493778890 is a wasteful number, since it uses less digits than its factorization.

493778890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104454.

The product of its (nonzero) digits is 3048192, while the sum is 55.

The square root of 493778890 is about 22221.1361095692. The cubic root of 493778890 is about 790.3949795425.

493778890 divided by its sum of digits (55) gives a palindrome (8977798).

The spelling of 493778890 in words is "four hundred ninety-three million, seven hundred seventy-eight thousand, eight hundred ninety".