787872021 has 8 divisors (see below), whose sum is σ = 1112289984. Its totient is φ = 494351040.

The previous prime is 787871989. The next prime is 787872049. The reversal of 787872021 is 120278787.

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

It is not a de Polignac number, because 787872021 - 2⁵ = 787871989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (787872091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7724185 + ... + 7724286.

It is an arithmetic number, because the mean of its divisors is an integer number (139036248).

Almost surely, 2^787872021 is an apocalyptic number.

It is an amenable number.

787872021 is a deficient number, since it is larger than the sum of its proper divisors (324417963).

787872021 is a wasteful number, since it uses less digits than its factorization.

787872021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15448491.

The product of its (nonzero) digits is 87808, while the sum is 42.

The square root of 787872021 is about 28069.0580711217. The cubic root of 787872021 is about 923.6027684313.

It can be divided in two parts, 78787 and 2021, that added together give a palindrome (80808).

The spelling of 787872021 in words is "seven hundred eighty-seven million, eight hundred seventy-two thousand, twenty-one".