102219978 has 96 divisors (see below), whose sum is σ = 248209920. Its totient is φ = 27965280.

The previous prime is 102219977. The next prime is 102220007. The reversal of 102219978 is 879912201.

It is not an unprimeable number, because it can be changed into a prime (102219973) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1231525 + ... + 1231607.

It is an arithmetic number, because the mean of its divisors is an integer number (2585520).

Almost surely, 2^102219978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 102219978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124104960).

102219978 is an abundant number, since it is smaller than the sum of its proper divisors (145989942).

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

102219978 is a wasteful number, since it uses less digits than its factorization.

102219978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 102219978 is about 10110.3896067362. The cubic root of 102219978 is about 467.5685171293.

The spelling of 102219978 in words is "one hundred two million, two hundred nineteen thousand, nine hundred seventy-eight".