51690606 has 16 divisors (see below), whose sum is σ = 112779648. Its totient is φ = 15663800.

The previous prime is 51690593. The next prime is 51690619. The reversal of 51690606 is 60609615.

It is an interprime number because it is at equal distance from previous prime (51690593) and next prime (51690619).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391530 + ... + 391661.

It is an arithmetic number, because the mean of its divisors is an integer number (7048728).

Almost surely, 2^51690606 is an apocalyptic number.

51690606 is an abundant number, since it is smaller than the sum of its proper divisors (61089042).

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

51690606 is a wasteful number, since it uses less digits than its factorization.

51690606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783207.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 51690606 is about 7189.6179314342. The cubic root of 51690606 is about 372.5093756180.

The spelling of 51690606 in words is "fifty-one million, six hundred ninety thousand, six hundred six".