51693720 has 96 divisors (see below), whose sum is σ = 167994000. Its totient is φ = 12719616.

The previous prime is 51693713. The next prime is 51693727. The reversal of 51693720 is 2739615.

It is an interprime number because it is at equal distance from previous prime (51693713) and next prime (51693727).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51693727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19006 + ... + 21554.

Almost surely, 2^51693720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51693720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83997000).

51693720 is an abundant number, since it is smaller than the sum of its proper divisors (116300280).

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

51693720 is a wasteful number, since it uses less digits than its factorization.

51693720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2589 (or 2572 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 51693720 is about 7189.8344904455. The cubic root of 51693720 is about 372.5168558353.

The spelling of 51693720 in words is "fifty-one million, six hundred ninety-three thousand, seven hundred twenty".