51880138 has 8 divisors (see below), whose sum is σ = 77971140. Its totient is φ = 25889760.

The previous prime is 51880133. The next prime is 51880181. The reversal of 51880138 is 83108815.

It can be written as a sum of positive squares in 2 ways, for example, as 48205249 + 3674889 = 6943^2 + 1917^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (51880133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23853 + ... + 25936.

Almost surely, 2^51880138 is an apocalyptic number.

51880138 is a deficient number, since it is larger than the sum of its proper divisors (26091002).

51880138 is a wasteful number, since it uses less digits than its factorization.

51880138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50312.

The product of its (nonzero) digits is 7680, while the sum is 34.

The square root of 51880138 is about 7202.7868217795. The cubic root of 51880138 is about 372.9641089890.

It can be divided in two parts, 518 and 80138, that added together give a square (80656 = 284²).

The spelling of 51880138 in words is "fifty-one million, eight hundred eighty thousand, one hundred thirty-eight".