51642285 has 16 divisors (see below), whose sum is σ = 86976960. Its totient is φ = 26092800.

The previous prime is 51642281. The next prime is 51642307. The reversal of 51642285 is 58224615.

It is not a de Polignac number, because 51642285 - 2² = 51642281 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51642281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90316 + ... + 90885.

It is an arithmetic number, because the mean of its divisors is an integer number (5436060).

Almost surely, 2^51642285 is an apocalyptic number.

It is an amenable number.

51642285 is a deficient number, since it is larger than the sum of its proper divisors (35334675).

51642285 is a wasteful number, since it uses less digits than its factorization.

51642285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181228.

The product of its digits is 19200, while the sum is 33.

The square root of 51642285 is about 7186.2566750708. The cubic root of 51642285 is about 372.3932640152.

The spelling of 51642285 in words is "fifty-one million, six hundred forty-two thousand, two hundred eighty-five".