1870820655 has 64 divisors (see below), whose sum is σ = 3468372480. Its totient is φ = 851558400.

The previous prime is 1870820647. The next prime is 1870820657. The reversal of 1870820655 is 5560280781.

It is not a de Polignac number, because 1870820655 - 2³ = 1870820647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1870820657) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 351615 + ... + 356895.

It is an arithmetic number, because the mean of its divisors is an integer number (54193320).

Almost surely, 2^1870820655 is an apocalyptic number.

1870820655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1870820655 is a deficient number, since it is larger than the sum of its proper divisors (1597551825).

1870820655 is a wasteful number, since it uses less digits than its factorization.

1870820655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5432.

The product of its (nonzero) digits is 134400, while the sum is 42.

The square root of 1870820655 is about 43252.9843479037. The cubic root of 1870820655 is about 1232.1891643868.

The spelling of 1870820655 in words is "one billion, eight hundred seventy million, eight hundred twenty thousand, six hundred fifty-five".