51408945 has 32 divisors (see below), whose sum is σ = 104451840. Its totient is φ = 23500800.

The previous prime is 51408937. The next prime is 51408953. The reversal of 51408945 is 54980415.

It is an interprime number because it is at equal distance from previous prime (51408937) and next prime (51408953).

It is not a de Polignac number, because 51408945 - 2³ = 51408937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26256 + ... + 28145.

It is an arithmetic number, because the mean of its divisors is an integer number (3264120).

Almost surely, 2^51408945 is an apocalyptic number.

It is an amenable number.

51408945 is an abundant number, since it is smaller than the sum of its proper divisors (53042895).

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

51408945 is a wasteful number, since it uses less digits than its factorization.

51408945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54422 (or 54416 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 51408945 is about 7170.0031380746. The cubic root of 51408945 is about 371.8315444361.

The spelling of 51408945 in words is "fifty-one million, four hundred eight thousand, nine hundred forty-five".