513911820 has 48 divisors (see below), whose sum is σ = 1453804128. Its totient is φ = 135628800.

The previous prime is 513911809. The next prime is 513911837. The reversal of 513911820 is 28119315.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38331 + ... + 49970.

It is an arithmetic number, because the mean of its divisors is an integer number (30287586).

Almost surely, 2^513911820 is an apocalyptic number.

It is an amenable number.

513911820 is an abundant number, since it is smaller than the sum of its proper divisors (939892308).

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

513911820 is a wasteful number, since it uses less digits than its factorization.

513911820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88410 (or 88408 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 513911820 is about 22669.6232875626. The cubic root of 513911820 is about 800.9945027763.

The spelling of 513911820 in words is "five hundred thirteen million, nine hundred eleven thousand, eight hundred twenty".