61636638 has 16 divisors (see below), whose sum is σ = 140883840. Its totient is φ = 17610456.

The previous prime is 61636633. The next prime is 61636643. The reversal of 61636638 is 83663616.

It is an interprime number because it is at equal distance from previous prime (61636633) and next prime (61636643).

It is a junction number, because it is equal to n+sod(n) for n = 61636596 and 61636605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61636633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 733728 + ... + 733811.

It is an arithmetic number, because the mean of its divisors is an integer number (8805240).

Almost surely, 2^61636638 is an apocalyptic number.

61636638 is an abundant number, since it is smaller than the sum of its proper divisors (79247202).

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

61636638 is a wasteful number, since it uses less digits than its factorization.

61636638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467551.

The product of its digits is 93312, while the sum is 39.

The square root of 61636638 is about 7850.9004579093. The cubic root of 61636638 is about 395.0144480108.

The spelling of 61636638 in words is "sixty-one million, six hundred thirty-six thousand, six hundred thirty-eight".