1613687620 has 24 divisors (see below), whose sum is σ = 3391616088. Its totient is φ = 644928000.

The previous prime is 1613687561. The next prime is 1613687633. The reversal of 1613687620 is 267863161.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 144192064 + 1469495556 = 12008^2 + 38334^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9571 + ... + 57610.

It is an arithmetic number, because the mean of its divisors is an integer number (141317337).

Almost surely, 2^1613687620 is an apocalyptic number.

1613687620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1613687620 is an abundant number, since it is smaller than the sum of its proper divisors (1777928468).

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

1613687620 is a wasteful number, since it uses less digits than its factorization.

1613687620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68391 (or 68389 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 1613687620 is about 40170.7308870526. The cubic root of 1613687620 is about 1172.9328664828.

The spelling of 1613687620 in words is "one billion, six hundred thirteen million, six hundred eighty-seven thousand, six hundred twenty".