51478505 has 32 divisors (see below), whose sum is σ = 71111040. Its totient is φ = 35458560.

The previous prime is 51478501. The next prime is 51478519. The reversal of 51478505 is 50587415.

It is not a de Polignac number, because 51478505 - 2² = 51478501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51478501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89870 + ... + 90440.

It is an arithmetic number, because the mean of its divisors is an integer number (2222220).

Almost surely, 2^51478505 is an apocalyptic number.

It is an amenable number.

51478505 is a deficient number, since it is larger than the sum of its proper divisors (19632535).

51478505 is a wasteful number, since it uses less digits than its factorization.

51478505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681.

The product of its (nonzero) digits is 28000, while the sum is 35.

The square root of 51478505 is about 7174.8522632874. The cubic root of 51478505 is about 371.9991737948. Note that the first 3 decimals are identical.

The spelling of 51478505 in words is "fifty-one million, four hundred seventy-eight thousand, five hundred five".