787684428 has 72 divisors (see below), whose sum is σ = 2090677680. Its totient is φ = 249701760.

The previous prime is 787684411. The next prime is 787684433. The reversal of 787684428 is 824486787.

It is a happy number.

787684428 is a `hidden beast` number, since 78 + 76 + 84 + 428 = 666.

It is a super-2 number, since 2×787684428² = 1240893516227374368, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64318 + ... + 75578.

It is an arithmetic number, because the mean of its divisors is an integer number (29037190).

Almost surely, 2^787684428 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 787684428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1045338840).

787684428 is an abundant number, since it is smaller than the sum of its proper divisors (1302993252).

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

787684428 is a wasteful number, since it uses less digits than its factorization.

787684428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11367 (or 11362 counting only the distinct ones).

The product of its digits is 4816896, while the sum is 54.

The square root of 787684428 is about 28065.7162388563. The cubic root of 787684428 is about 923.5294590771.

The spelling of 787684428 in words is "seven hundred eighty-seven million, six hundred eighty-four thousand, four hundred twenty-eight".