51229040 has 20 divisors (see below), whose sum is σ = 119107704. Its totient is φ = 20491584.

The previous prime is 51229037. The next prime is 51229063. The reversal of 51229040 is 4092215.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-3 number, since 3×51229040³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51228997 and 51229015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320102 + ... + 320261.

Almost surely, 2^51229040 is an apocalyptic number.

It is an amenable number.

51229040 is an abundant number, since it is smaller than the sum of its proper divisors (67878664).

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

51229040 is a wasteful number, since it uses less digits than its factorization.

51229040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640376 (or 640370 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 51229040 is about 7157.4464720318. The cubic root of 51229040 is about 371.3972974514.

The spelling of 51229040 in words is "fifty-one million, two hundred twenty-nine thousand, forty".