51581408 has 24 divisors (see below), whose sum is σ = 102207672. Its totient is φ = 25623936.

The previous prime is 51581393. The next prime is 51581423. The reversal of 51581408 is 80418515.

It is an interprime number because it is at equal distance from previous prime (51581393) and next prime (51581423).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110 + ... + 10157.

It is an arithmetic number, because the mean of its divisors is an integer number (4258653).

Almost surely, 2^51581408 is an apocalyptic number.

It is an amenable number.

51581408 is a deficient number, since it is larger than the sum of its proper divisors (50626264).

51581408 is a wasteful number, since it uses less digits than its factorization.

51581408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10434 (or 10426 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 32.

The square root of 51581408 is about 7182.0197716241. The cubic root of 51581408 is about 372.2468781701.

The spelling of 51581408 in words is "fifty-one million, five hundred eighty-one thousand, four hundred eight".