51020000 has 60 divisors (see below), whose sum is σ = 125566056. Its totient is φ = 20400000.

The previous prime is 51019999. The next prime is 51020029. The reversal of 51020000 is 2015.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a self number, because there is not a number n which added to its sum of digits gives 51020000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 18725 + ... + 21275.

Almost surely, 2^51020000 is an apocalyptic number.

51020000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62783028).

51020000 is an abundant number, since it is smaller than the sum of its proper divisors (74546056).

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

51020000 is an equidigital number, since it uses as much as digits as its factorization.

51020000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581 (or 2558 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 8.

The square root of 51020000 is about 7142.8285713714. The cubic root of 51020000 is about 370.8914467974.

Adding to 51020000 its reverse (2015), we get a palindrome (51022015).

The spelling of 51020000 in words is "fifty-one million, twenty thousand".