51906240 has 168 divisors, whose sum is σ = 181874160. Its totient is φ = 13584384.

The previous prime is 51906229. The next prime is 51906251. The reversal of 51906240 is 4260915.

It is an interprime number because it is at equal distance from previous prime (51906229) and next prime (51906251).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 192826 + ... + 193094.

Almost surely, 2^51906240 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 51906240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90937080).

51906240 is an abundant number, since it is smaller than the sum of its proper divisors (129967920).

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

51906240 is a wasteful number, since it uses less digits than its factorization.

51906240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 51906240 is about 7204.5985314936. The cubic root of 51906240 is about 373.0266472253.

The spelling of 51906240 in words is "fifty-one million, nine hundred six thousand, two hundred forty".