51421770 has 96 divisors (see below), whose sum is σ = 145886400. Its totient is φ = 12886272.

The previous prime is 51421757. The next prime is 51421789. The reversal of 51421770 is 7712415.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 77701 + ... + 78359.

It is an arithmetic number, because the mean of its divisors is an integer number (1519650).

Almost surely, 2^51421770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51421770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72943200).

51421770 is an abundant number, since it is smaller than the sum of its proper divisors (94464630).

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

51421770 is a wasteful number, since it uses less digits than its factorization.

51421770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709 (or 686 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 51421770 is about 7170.8974333761. The cubic root of 51421770 is about 371.8624621623.

It can be divided in two parts, 51 and 421770, that added together give a triangular number (421821 = T₉₁₈).

The spelling of 51421770 in words is "fifty-one million, four hundred twenty-one thousand, seven hundred seventy".