51662620 has 12 divisors (see below), whose sum is σ = 108491544. Its totient is φ = 20665040.

The previous prime is 51662617. The next prime is 51662641. The reversal of 51662620 is 2626615.

51662620 is nontrivially palindromic in base 9.

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, 1291546 + ... + 1291585.

It is an arithmetic number, because the mean of its divisors is an integer number (9040962).

Almost surely, 2^51662620 is an apocalyptic number.

It is an amenable number.

51662620 is an abundant number, since it is smaller than the sum of its proper divisors (56828924).

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

51662620 is a wasteful number, since it uses less digits than its factorization.

51662620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2583140 (or 2583138 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 51662620 is about 7187.6713892609. The cubic root of 51662620 is about 372.4421362607.

It can be divided in two parts, 516 and 62620, that added together give a palindrome (63136).

The spelling of 51662620 in words is "fifty-one million, six hundred sixty-two thousand, six hundred twenty".