51069216 has 96 divisors (see below), whose sum is σ = 147728448. Its totient is φ = 15319040.

The previous prime is 51069211. The next prime is 51069233. The reversal of 51069216 is 61296015.

51069216 = T₃₅₃ + T₃₅₄ + ... + T₇₀₄.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (51069211) 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, 144496 + ... + 144848.

It is an arithmetic number, because the mean of its divisors is an integer number (1538838).

Almost surely, 2^51069216 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 51069216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73864224).

51069216 is an abundant number, since it is smaller than the sum of its proper divisors (96659232).

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

51069216 is a wasteful number, since it uses less digits than its factorization.

51069216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514 (or 506 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 51069216 is about 7146.2728747229. The cubic root of 51069216 is about 371.0106675418.

The spelling of 51069216 in words is "fifty-one million, sixty-nine thousand, two hundred sixteen".