1613545820 has 48 divisors (see below), whose sum is σ = 3591514080. Its totient is φ = 606818304.

The previous prime is 1613545781. The next prime is 1613545823. The reversal of 1613545820 is 285453161.

It is a super-2 number, since 2×1613545820² = 5207060226478944800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1613545823) 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, 439151 + ... + 442809.

It is an arithmetic number, because the mean of its divisors is an integer number (74823210).

Almost surely, 2^1613545820 is an apocalyptic number.

1613545820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1613545820 is an abundant number, since it is smaller than the sum of its proper divisors (1977968260).

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

1613545820 is a wasteful number, since it uses less digits than its factorization.

1613545820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4982 (or 4980 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 1613545820 is about 40168.9658816355. The cubic root of 1613545820 is about 1172.8985089962.

Adding to 1613545820 its reverse (285453161), we get a palindrome (1898998981).

The spelling of 1613545820 in words is "one billion, six hundred thirteen million, five hundred forty-five thousand, eight hundred twenty".