102420078 has 8 divisors (see below), whose sum is σ = 204840168. Its totient is φ = 34140024.

The previous prime is 102420077. The next prime is 102420119. The reversal of 102420078 is 870024201.

It is a sphenic number, since it is the product of 3 distinct primes.

102420078 is an admirable number.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102420077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8535001 + ... + 8535012.

It is an arithmetic number, because the mean of its divisors is an integer number (25605021).

Almost surely, 2^102420078 is an apocalyptic number.

102420078 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

102420078 is a wasteful number, since it uses less digits than its factorization.

102420078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17070018.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 102420078 is about 10120.2805297087. The cubic root of 102420078 is about 467.8734134221.

Adding to 102420078 its reverse (870024201), we get a palindrome (972444279).

The spelling of 102420078 in words is "one hundred two million, four hundred twenty thousand, seventy-eight".