787661280 has 432 divisors, whose sum is σ = 3260340720. Its totient is φ = 177085440.

The previous prime is 787661279. The next prime is 787661311. The reversal of 787661280 is 82166787.

787661280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (432).

It is a super-2 number, since 2×787661280² = 1240820584022476800, which contains 22 as substring.

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 71 ways as a sum of consecutive naturals, for example, 12912450 + ... + 12912510.

It is an arithmetic number, because the mean of its divisors is an integer number (7547085).

Almost surely, 2^787661280 is an apocalyptic number.

787661280 is a gapful number since it is divisible by the number (70) 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 787661280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1630170360).

787661280 is an abundant number, since it is smaller than the sum of its proper divisors (2472679440).

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

787661280 is a wasteful number, since it uses less digits than its factorization.

787661280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 787661280 is about 28065.3038465647. The cubic root of 787661280 is about 923.5204122776.

The spelling of 787661280 in words is "seven hundred eighty-seven million, six hundred sixty-one thousand, two hundred eighty".