51403680 has 192 divisors, whose sum is σ = 183496320. Its totient is φ = 13436928.

The previous prime is 51403669. The next prime is 51403687. The reversal of 51403680 is 8630415.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51403687) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 315279 + ... + 315441.

It is an arithmetic number, because the mean of its divisors is an integer number (955710).

Almost surely, 2^51403680 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 51403680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91748160).

51403680 is an abundant number, since it is smaller than the sum of its proper divisors (132092640).

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

51403680 is a wasteful number, since it uses less digits than its factorization.

51403680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 51403680 is about 7169.6359740227. The cubic root of 51403680 is about 371.8188504071.

The spelling of 51403680 in words is "fifty-one million, four hundred three thousand, six hundred eighty".