51720367000 has 64 divisors (see below), whose sum is σ = 121215968640. Its totient is φ = 20655616000.

The previous prime is 51720366979. The next prime is 51720367021. The reversal of 51720367000 is 76302715.

It is an interprime number because it is at equal distance from previous prime (51720366979) and next prime (51720367021).

It is a super-2 number, since 2×51720367000² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 600657 + ... + 681343.

It is an arithmetic number, because the mean of its divisors is an integer number (1893999510).

Almost surely, 2^51720367000 is an apocalyptic number.

51720367000 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 51720367000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60607984320).

51720367000 is an abundant number, since it is smaller than the sum of its proper divisors (69495601640).

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

51720367000 is a wasteful number, since it uses less digits than its factorization.

51720367000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81349 (or 81335 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 31.

Adding to 51720367000 its reverse (76302715), we get a palindrome (51796669715).

The spelling of 51720367000 in words is "fifty-one billion, seven hundred twenty million, three hundred sixty-seven thousand".