511220988 has 36 divisors (see below), whose sum is σ = 1311546600. Its totient is φ = 167862816.

The previous prime is 511220981. The next prime is 511220999. The reversal of 511220988 is 889022115.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×511220988² = 522693797143392288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511220981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103563 + ... + 108386.

It is an arithmetic number, because the mean of its divisors is an integer number (36431850).

Almost surely, 2^511220988 is an apocalyptic number.

It is an amenable number.

511220988 is an abundant number, since it is smaller than the sum of its proper divisors (800325612).

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

511220988 is a wasteful number, since it uses less digits than its factorization.

511220988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212026 (or 212021 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 511220988 is about 22610.1965493447. The cubic root of 511220988 is about 799.5940586327.

The spelling of 511220988 in words is "five hundred eleven million, two hundred twenty thousand, nine hundred eighty-eight".