511777980 has 96 divisors (see below), whose sum is σ = 1819668480. Its totient is φ = 116976960.

The previous prime is 511777963. The next prime is 511778023. The reversal of 511777980 is 89777115.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63916 + ... + 71475.

It is an arithmetic number, because the mean of its divisors is an integer number (18954880).

Almost surely, 2^511777980 is an apocalyptic number.

It is an amenable number.

511777980 is an abundant number, since it is smaller than the sum of its proper divisors (1307890500).

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

511777980 is a wasteful number, since it uses less digits than its factorization.

511777980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135416 (or 135408 counting only the distinct ones).

The product of its (nonzero) digits is 123480, while the sum is 45.

The square root of 511777980 is about 22622.5104707678. The cubic root of 511777980 is about 799.8843478649.

The spelling of 511777980 in words is "five hundred eleven million, seven hundred seventy-seven thousand, nine hundred eighty".