511545420 has 72 divisors (see below), whose sum is σ = 1559594400. Its totient is φ = 135717120.

The previous prime is 511545409. The next prime is 511545427. The reversal of 511545420 is 24545115.

511545420 is a `hidden beast` number, since 5 + 115 + 4 + 542 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (511545427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28680 + ... + 42960.

Almost surely, 2^511545420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 511545420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (779797200).

511545420 is an abundant number, since it is smaller than the sum of its proper divisors (1048048980).

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

511545420 is a wasteful number, since it uses less digits than its factorization.

511545420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14495 (or 14490 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 511545420 is about 22617.3698736170. The cubic root of 511545420 is about 799.7631694794.

The spelling of 511545420 in words is "five hundred eleven million, five hundred forty-five thousand, four hundred twenty".