787247661 has 8 divisors (see below), whose sum is σ = 1050257440. Its totient is φ = 524534832.

The previous prime is 787247623. The next prime is 787247689. The reversal of 787247661 is 166742787.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 787247661 - 2⁷ = 787247533 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 787247661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (787247861) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 67975 + ... + 78708.

It is an arithmetic number, because the mean of its divisors is an integer number (131282180).

Almost surely, 2^787247661 is an apocalyptic number.

It is an amenable number.

787247661 is a deficient number, since it is larger than the sum of its proper divisors (263009779).

787247661 is a wasteful number, since it uses less digits than its factorization.

787247661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148475.

The product of its digits is 790272, while the sum is 48.

The square root of 787247661 is about 28057.9340116125. The cubic root of 787247661 is about 923.3587300580.

The spelling of 787247661 in words is "seven hundred eighty-seven million, two hundred forty-seven thousand, six hundred sixty-one".