102258778 has 4 divisors (see below), whose sum is σ = 153388170. Its totient is φ = 51129388.

The previous prime is 102258769. The next prime is 102258823. The reversal of 102258778 is 877852201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 52316289 + 49942489 = 7233^2 + 7067^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 102258778.

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 as a sum of consecutive naturals, namely, 25564693 + ... + 25564696.

Almost surely, 2^102258778 is an apocalyptic number.

102258778 is a deficient number, since it is larger than the sum of its proper divisors (51129392).

102258778 is an equidigital number, since it uses as much as digits as its factorization.

102258778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51129391.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 102258778 is about 10112.3082429285. The cubic root of 102258778 is about 467.6276685265.

The spelling of 102258778 in words is "one hundred two million, two hundred fifty-eight thousand, seven hundred seventy-eight".