51662240 has 96 divisors (see below), whose sum is σ = 140797440. Its totient is φ = 17547264.

The previous prime is 51662239. The next prime is 51662243. The reversal of 51662240 is 4226615.

It is a super-3 number, since 3×51662240³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (51662243) 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, 216041 + ... + 216279.

It is an arithmetic number, because the mean of its divisors is an integer number (1466640).

Almost surely, 2^51662240 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 51662240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70398720).

51662240 is an abundant number, since it is smaller than the sum of its proper divisors (89135200).

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

51662240 is a wasteful number, since it uses less digits than its factorization.

51662240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454 (or 446 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 51662240 is about 7187.6449550600. The cubic root of 51662240 is about 372.4412231030.

Adding to 51662240 its reverse (4226615), we get a palindrome (55888855).

The spelling of 51662240 in words is "fifty-one million, six hundred sixty-two thousand, two hundred forty".