51379890 has 32 divisors (see below), whose sum is σ = 123520896. Its totient is φ = 13678080.

The previous prime is 51379879. The next prime is 51379897. The reversal of 51379890 is 9897315.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (51379897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23650 + ... + 25730.

It is an arithmetic number, because the mean of its divisors is an integer number (3860028).

Almost surely, 2^51379890 is an apocalyptic number.

51379890 is an abundant number, since it is smaller than the sum of its proper divisors (72141006).

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

51379890 is a wasteful number, since it uses less digits than its factorization.

51379890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2914.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 51379890 is about 7167.9767019711. The cubic root of 51379890 is about 371.7614813925.

The spelling of 51379890 in words is "fifty-one million, three hundred seventy-nine thousand, eight hundred ninety".