787640436 has 120 divisors (see below), whose sum is σ = 2319018240. Its totient is φ = 230947200.

The previous prime is 787640407. The next prime is 787640437. The reversal of 787640436 is 634046787.

It is a junction number, because it is equal to n+sod(n) for n = 787640391 and 787640400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (787640437) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 106920 + ... + 114048.

It is an arithmetic number, because the mean of its divisors is an integer number (19325152).

Almost surely, 2^787640436 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 787640436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1159509120).

787640436 is an abundant number, since it is smaller than the sum of its proper divisors (1531377804).

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

787640436 is a wasteful number, since it uses less digits than its factorization.

787640436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7187 (or 7176 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The square root of 787640436 is about 28064.9324959103. The cubic root of 787640436 is about 923.5122657855.

The spelling of 787640436 in words is "seven hundred eighty-seven million, six hundred forty thousand, four hundred thirty-six".