51891480 has 192 divisors, whose sum is σ = 182800800. Its totient is φ = 12718080.

The previous prime is 51891461. The next prime is 51891481. The reversal of 51891480 is 8419815.

51891480 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51891481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 373251 + ... + 373389.

Almost surely, 2^51891480 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 51891480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91400400).

51891480 is an abundant number, since it is smaller than the sum of its proper divisors (130909320).

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

51891480 is a wasteful number, since it uses less digits than its factorization.

51891480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 51891480 is about 7203.5741128970. The cubic root of 51891480 is about 372.9912860607.

The spelling of 51891480 in words is "fifty-one million, eight hundred ninety-one thousand, four hundred eighty".