51979746 has 128 divisors (see below), whose sum is σ = 137281536. Its totient is φ = 12752640.

The previous prime is 51979729. The next prime is 51979757. The reversal of 51979746 is 64797915.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 51979695 and 51979704.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 626221 + ... + 626303.

It is an arithmetic number, because the mean of its divisors is an integer number (1072512).

Almost surely, 2^51979746 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51979746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68640768).

51979746 is an abundant number, since it is smaller than the sum of its proper divisors (85301790).

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

51979746 is a wasteful number, since it uses less digits than its factorization.

51979746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176.

The product of its digits is 476280, while the sum is 48.

The square root of 51979746 is about 7209.6980519298. The cubic root of 51979746 is about 373.2026489521.

It can be divided in two parts, 51979 and 746, that added together give a palindrome (52725).

The spelling of 51979746 in words is "fifty-one million, nine hundred seventy-nine thousand, seven hundred forty-six".