51122040 has 64 divisors (see below), whose sum is σ = 154344960. Its totient is φ = 13545600.

The previous prime is 51122021. The next prime is 51122047. The reversal of 51122040 is 4022115.

It is a super-2 number, since 2×51122040² = 5226925947523200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51122047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18765 + ... + 21315.

It is an arithmetic number, because the mean of its divisors is an integer number (2411640).

Almost surely, 2^51122040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51122040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77172480).

51122040 is an abundant number, since it is smaller than the sum of its proper divisors (103222920).

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

51122040 is a wasteful number, since it uses less digits than its factorization.

51122040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2732 (or 2728 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 51122040 is about 7149.9678320955. The cubic root of 51122040 is about 371.1385431042.

Adding to 51122040 its reverse (4022115), we get a palindrome (55144155).

The spelling of 51122040 in words is "fifty-one million, one hundred twenty-two thousand, forty".