51020415240 has 32 divisors (see below), whose sum is σ = 153061246080. Its totient is φ = 13605444032.

The previous prime is 51020415221. The next prime is 51020415253. The reversal of 51020415240 is 4251402015.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 51020415240.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212584944 + ... + 212585183.

It is an arithmetic number, because the mean of its divisors is an integer number (4783163940).

Almost surely, 2^51020415240 is an apocalyptic number.

It is an amenable number.

51020415240 is an abundant number, since it is smaller than the sum of its proper divisors (102040830840).

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

51020415240 is a wasteful number, since it uses less digits than its factorization.

51020415240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425170141 (or 425170137 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 51020415240 its reverse (4251402015), we get a palindrome (55271817255).

The spelling of 51020415240 in words is "fifty-one billion, twenty million, four hundred fifteen thousand, two hundred forty".