51020604 has 120 divisors (see below), whose sum is σ = 144532080. Its totient is φ = 15634944.

The previous prime is 51020597. The next prime is 51020617. The reversal of 51020604 is 40602015.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 324894 + ... + 325050.

It is an arithmetic number, because the mean of its divisors is an integer number (1204434).

Almost surely, 2^51020604 is an apocalyptic number.

51020604 is a gapful number since it is divisible by the number (54) 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 51020604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72266040).

51020604 is an abundant number, since it is smaller than the sum of its proper divisors (93511476).

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

51020604 is a wasteful number, since it uses less digits than its factorization.

51020604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 51020604 is about 7142.8708514154. The cubic root of 51020604 is about 370.8929103904.

Adding to 51020604 its reverse (40602015), we get a palindrome (91622619).

The spelling of 51020604 in words is "fifty-one million, twenty thousand, six hundred four".