51020664 has 32 divisors (see below), whose sum is σ = 128095440. Its totient is φ = 16934400.

The previous prime is 51020653. The next prime is 51020677. The reversal of 51020664 is 46602015.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1374 + ... + 10194.

Almost surely, 2^51020664 is an apocalyptic number.

It is an amenable number.

51020664 is an abundant number, since it is smaller than the sum of its proper divisors (77074776).

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

51020664 is a wasteful number, since it uses less digits than its factorization.

51020664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9071 (or 9067 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 51020664 is about 7142.8750514061. The cubic root of 51020664 is about 370.8930557798.

Adding to 51020664 its reverse (46602015), we get a palindrome (97622679).

The spelling of 51020664 in words is "fifty-one million, twenty thousand, six hundred sixty-four".