157785820 has 12 divisors (see below), whose sum is σ = 331350264. Its totient is φ = 63114320.

The previous prime is 157785767. The next prime is 157785821. The reversal of 157785820 is 28587751.

157785820 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157785821) 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 3 ways as a sum of consecutive naturals, for example, 3944626 + ... + 3944665.

It is an arithmetic number, because the mean of its divisors is an integer number (27612522).

Almost surely, 2^157785820 is an apocalyptic number.

157785820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

157785820 is an abundant number, since it is smaller than the sum of its proper divisors (173564444).

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

157785820 is a wasteful number, since it uses less digits than its factorization.

157785820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7889300 (or 7889298 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 43.

The square root of 157785820 is about 12561.2825778262. The cubic root of 157785820 is about 540.3676280369.

The spelling of 157785820 in words is "one hundred fifty-seven million, seven hundred eighty-five thousand, eight hundred twenty".