428781780 has 144 divisors (see below), whose sum is σ = 1507693824. Its totient is φ = 96606720.

The previous prime is 428781763. The next prime is 428781811. The reversal of 428781780 is 87187824.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87064 + ... + 91856.

It is an arithmetic number, because the mean of its divisors is an integer number (10470096).

Almost surely, 2^428781780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 428781780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (753846912).

428781780 is an abundant number, since it is smaller than the sum of its proper divisors (1078912044).

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

428781780 is a wasteful number, since it uses less digits than its factorization.

428781780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4886 (or 4881 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 45.

The square root of 428781780 is about 20707.0466266921. The cubic root of 428781780 is about 754.0707717813.

The spelling of 428781780 in words is "four hundred twenty-eight million, seven hundred eighty-one thousand, seven hundred eighty".