51969450 has 96 divisors (see below), whose sum is σ = 143740800. Its totient is φ = 12337920.

The previous prime is 51969433. The next prime is 51969469. The reversal of 51969450 is 5496915.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 51969399 and 51969408.

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, 56091 + ... + 57009.

It is an arithmetic number, because the mean of its divisors is an integer number (1497300).

Almost surely, 2^51969450 is an apocalyptic number.

51969450 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51969450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71870400).

51969450 is an abundant number, since it is smaller than the sum of its proper divisors (91771350).

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

51969450 is a wasteful number, since it uses less digits than its factorization.

51969450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976 (or 971 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 51969450 is about 7208.9839783426. The cubic root of 51969450 is about 373.1780063525.

The spelling of 51969450 in words is "fifty-one million, nine hundred sixty-nine thousand, four hundred fifty".