1620120670 has 32 divisors (see below), whose sum is σ = 3447748800. Its totient is φ = 536315136.

The previous prime is 1620120661. The next prime is 1620120679. The reversal of 1620120670 is 760210261.

It is an interprime number because it is at equal distance from previous prime (1620120661) and next prime (1620120679).

It is a super-2 number, since 2×1620120670² = 5249581970722497800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620120679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 397015 + ... + 401074.

It is an arithmetic number, because the mean of its divisors is an integer number (107742150).

Almost surely, 2^1620120670 is an apocalyptic number.

1620120670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1620120670 is an abundant number, since it is smaller than the sum of its proper divisors (1827628130).

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

1620120670 is a wasteful number, since it uses less digits than its factorization.

1620120670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798132.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 1620120670 is about 40250.7226022093. The cubic root of 1620120670 is about 1174.4894525574.

The spelling of 1620120670 in words is "one billion, six hundred twenty million, one hundred twenty thousand, six hundred seventy".