787155840 has 128 divisors (see below), whose sum is σ = 2787904800. Its totient is φ = 209903616.

The previous prime is 787155839. The next prime is 787155857. The reversal of 787155840 is 48551787.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×787155840² = 1239228632892211200, 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 15 ways as a sum of consecutive naturals, for example, 5497 + ... + 40056.

Almost surely, 2^787155840 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 787155840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1393952400).

787155840 is an abundant number, since it is smaller than the sum of its proper divisors (2000748960).

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

787155840 is a wasteful number, since it uses less digits than its factorization.

787155840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45581 (or 45563 counting only the distinct ones).

The product of its (nonzero) digits is 313600, while the sum is 45.

The square root of 787155840 is about 28056.2976887543. The cubic root of 787155840 is about 923.3228298695.

The spelling of 787155840 in words is "seven hundred eighty-seven million, one hundred fifty-five thousand, eight hundred forty".