428615280 has 160 divisors (see below), whose sum is σ = 1501005120. Its totient is φ = 112389120.

The previous prime is 428615279. The next prime is 428615303. The reversal of 428615280 is 82516824.

428615280 is a `hidden beast` number, since 428 + 6 + 152 + 80 = 666.

It is a super-2 number, since 2×428615280² = 367422116498956800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130134 + ... + 133386.

It is an arithmetic number, because the mean of its divisors is an integer number (9381282).

Almost surely, 2^428615280 is an apocalyptic number.

428615280 is a gapful number since it is divisible by the number (40) 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 428615280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (750502560).

428615280 is an abundant number, since it is smaller than the sum of its proper divisors (1072389840).

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

428615280 is a wasteful number, since it uses less digits than its factorization.

428615280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3336 (or 3324 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 428615280 is about 20703.0258658004. The cubic root of 428615280 is about 753.9731548862.

The spelling of 428615280 in words is "four hundred twenty-eight million, six hundred fifteen thousand, two hundred eighty".