51615035400 has 96 divisors (see below), whose sum is σ = 160576552800.
Its totient is φ = 13714982400.
The previous prime is 51615035393. The next prime is 51615035411. The reversal of 51615035400 is 453051615.
It is a super-2 number, since 2×516150354002 (a number of 22 digits) contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (30).
It is an unprimeable number.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15531 + ... + 321669.
It is an arithmetic number, because the mean of its divisors is an integer number (1672672425).
Almost surely, 251615035400 is an apocalyptic number.
51615035400 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 51615035400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80288276400).
51615035400 is an abundant number, since it is smaller than the sum of its proper divisors (108961517400).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
51615035400 is a wasteful number, since it uses less digits than its factorization.
51615035400 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 306439 (or 306430 counting only the distinct ones).
The product of its (nonzero) digits is 9000, while the sum is 30.
The spelling of 51615035400 in words is "fifty-one billion, six hundred fifteen million, thirty-five thousand, four hundred".