1671261620 has 36 divisors (see below), whose sum is σ = 4082655780. Its totient is φ = 573003648.

The previous prime is 1671261589. The next prime is 1671261637. The reversal of 1671261620 is 261621761.

It can be written as a sum of positive squares in 2 ways, for example, as 529092004 + 1142169616 = 23002^2 + 33796^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 851705 + ... + 853664.

It is an arithmetic number, because the mean of its divisors is an integer number (113407105).

Almost surely, 2^1671261620 is an apocalyptic number.

1671261620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1671261620 is an abundant number, since it is smaller than the sum of its proper divisors (2411394160).

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

1671261620 is a wasteful number, since it uses less digits than its factorization.

1671261620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1705392 (or 1705383 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 1671261620 is about 40881.0667669032. The cubic root of 1671261620 is about 1186.7196856265.

The spelling of 1671261620 in words is "one billion, six hundred seventy-one million, two hundred sixty-one thousand, six hundred twenty".