102420780 has 144 divisors (see below), whose sum is σ = 364041216. Its totient is φ = 21275520.

The previous prime is 102420763. The next prime is 102420781. The reversal of 102420780 is 87024201.

It is a self number, because there is not a number n which added to its sum of digits gives 102420780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102420781) 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, 30757 + ... + 33923.

It is an arithmetic number, because the mean of its divisors is an integer number (2528064).

Almost surely, 2^102420780 is an apocalyptic number.

102420780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 102420780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182020608).

102420780 is an abundant number, since it is smaller than the sum of its proper divisors (261620436).

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

102420780 is a wasteful number, since it uses less digits than its factorization.

102420780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3204 (or 3195 counting only the distinct ones).

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

The square root of 102420780 is about 10120.3152124823. The cubic root of 102420780 is about 467.8744823739.

Adding to 102420780 its reverse (87024201), we get a palindrome (189444981).

The spelling of 102420780 in words is "one hundred two million, four hundred twenty thousand, seven hundred eighty".