511698642 has 64 divisors (see below), whose sum is σ = 1275617280. Its totient is φ = 133233984.

The previous prime is 511698619. The next prime is 511698643. The reversal of 511698642 is 246896115.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 511698594 and 511698603.

It is not an unprimeable number, because it can be changed into a prime (511698643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37203 + ... + 49065.

It is an arithmetic number, because the mean of its divisors is an integer number (19931520).

Almost surely, 2^511698642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 511698642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (637808640).

511698642 is an abundant number, since it is smaller than the sum of its proper divisors (763918638).

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

511698642 is a wasteful number, since it uses less digits than its factorization.

511698642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11967.

The product of its digits is 103680, while the sum is 42.

The square root of 511698642 is about 22620.7568838887. The cubic root of 511698642 is about 799.8430119038.

It can be divided in two parts, 511 and 698642, that added together give a triangular number (699153 = T₁₁₈₂).

The spelling of 511698642 in words is "five hundred eleven million, six hundred ninety-eight thousand, six hundred forty-two".