787438864 has 10 divisors (see below), whose sum is σ = 1525662830. Its totient is φ = 393719424.

The previous prime is 787438859. The next prime is 787438889. The reversal of 787438864 is 468834787.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 751198464 + 36240400 = 27408^2 + 6020^2 .

It is a super-2 number, since 2×787438864² = 1240119929075220992, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24607449 + ... + 24607480.

It is an arithmetic number, because the mean of its divisors is an integer number (152566283).

Almost surely, 2^787438864 is an apocalyptic number.

It is an amenable number.

787438864 is a deficient number, since it is larger than the sum of its proper divisors (738223966).

787438864 is a wasteful number, since it uses less digits than its factorization.

787438864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49214937 (or 49214931 counting only the distinct ones).

The product of its digits is 7225344, while the sum is 55.

The square root of 787438864 is about 28061.3410941102. The cubic root of 787438864 is about 923.4334776785.

The spelling of 787438864 in words is "seven hundred eighty-seven million, four hundred thirty-eight thousand, eight hundred sixty-four".