51485544 has 160 divisors (see below), whose sum is σ = 163088640. Its totient is φ = 15033600.

The previous prime is 51485531. The next prime is 51485557. The reversal of 51485544 is 44558415.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51485531) and next prime (51485557).

It is a super-2 number, since 2×51485544² = 5301522481951872, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 51485499 and 51485508.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 220852 + ... + 221084.

It is an arithmetic number, because the mean of its divisors is an integer number (1019304).

Almost surely, 2^51485544 is an apocalyptic number.

51485544 is a gapful number since it is divisible by the number (54) 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 51485544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81544320).

51485544 is an abundant number, since it is smaller than the sum of its proper divisors (111603096).

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

51485544 is a wasteful number, since it uses less digits than its factorization.

51485544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293 (or 280 counting only the distinct ones).

The product of its digits is 64000, while the sum is 36.

The square root of 51485544 is about 7175.3427792685. The cubic root of 51485544 is about 372.0161283330.

The spelling of 51485544 in words is "fifty-one million, four hundred eighty-five thousand, five hundred forty-four".