51158240 has 48 divisors (see below), whose sum is σ = 138130272. Its totient is φ = 17539584.

The previous prime is 51158227. The next prime is 51158249. The reversal of 51158240 is 4285115.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51158249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21719 + ... + 23958.

It is an arithmetic number, because the mean of its divisors is an integer number (2877714).

Almost surely, 2^51158240 is an apocalyptic number.

It is an amenable number.

51158240 is an abundant number, since it is smaller than the sum of its proper divisors (86972032).

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

51158240 is a wasteful number, since it uses less digits than its factorization.

51158240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45699 (or 45691 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 51158240 is about 7152.4988640335. The cubic root of 51158240 is about 371.2261246724.

The spelling of 51158240 in words is "fifty-one million, one hundred fifty-eight thousand, two hundred forty".