51620618 has 12 divisors (see below), whose sum is σ = 90072882. Its totient is φ = 22123080.

The previous prime is 51620593. The next prime is 51620651. The reversal of 51620618 is 81602615.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 44129449 + 7491169 = 6643^2 + 2737^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 263273 + ... + 263468.

Almost surely, 2^51620618 is an apocalyptic number.

51620618 is a deficient number, since it is larger than the sum of its proper divisors (38452264).

51620618 is a wasteful number, since it uses less digits than its factorization.

51620618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526757 (or 526750 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 51620618 is about 7184.7489865687. The cubic root of 51620618 is about 372.3411763798.

The spelling of 51620618 in words is "fifty-one million, six hundred twenty thousand, six hundred eighteen".