51897144 has 64 divisors (see below), whose sum is σ = 143166240. Its totient is φ = 15575040.

The previous prime is 51897143. The next prime is 51897149. The reversal of 51897144 is 44179815.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51897143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10764 + ... + 14820.

Almost surely, 2^51897144 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 51897144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71583120).

51897144 is an abundant number, since it is smaller than the sum of its proper divisors (91269096).

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

51897144 is a wasteful number, since it uses less digits than its factorization.

51897144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4120 (or 4116 counting only the distinct ones).

The product of its digits is 40320, while the sum is 39.

The square root of 51897144 is about 7203.9672403475. The cubic root of 51897144 is about 373.0048563410.

The spelling of 51897144 in words is "fifty-one million, eight hundred ninety-seven thousand, one hundred forty-four".