51005400 has 48 divisors (see below), whose sum is σ = 158118600. Its totient is φ = 13601280.

The previous prime is 51005393. The next prime is 51005429. The reversal of 51005400 is 450015.

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

It is a self number, because there is not a number n which added to its sum of digits gives 51005400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41905 + ... + 43104.

Almost surely, 2^51005400 is an apocalyptic number.

51005400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51005400 is an abundant number, since it is smaller than the sum of its proper divisors (107113200).

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

51005400 is a wasteful number, since it uses less digits than its factorization.

51005400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85028 (or 85019 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 51005400 is about 7141.8064941582. The cubic root of 51005400 is about 370.8560650404.

Adding to 51005400 its reverse (450015), we get a palindrome (51455415).

The spelling of 51005400 in words is "fifty-one million, five thousand, four hundred".