51347478 has 64 divisors (see below), whose sum is σ = 127411200. Its totient is φ = 13433472.

The previous prime is 51347467. The next prime is 51347479. The reversal of 51347478 is 87474315.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51347479) 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, 85423 + ... + 86021.

It is an arithmetic number, because the mean of its divisors is an integer number (1990800).

Almost surely, 2^51347478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51347478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63705600).

51347478 is an abundant number, since it is smaller than the sum of its proper divisors (76063722).

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

51347478 is a wasteful number, since it uses less digits than its factorization.

51347478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781.

The product of its digits is 94080, while the sum is 39.

The square root of 51347478 is about 7165.7154562542. The cubic root of 51347478 is about 371.6832921259.

The spelling of 51347478 in words is "fifty-one million, three hundred forty-seven thousand, four hundred seventy-eight".