61263636 has 24 divisors (see below), whose sum is σ = 163369920. Its totient is φ = 17503872.

The previous prime is 61263617. The next prime is 61263637. The reversal of 61263636 is 63636216.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 61263597 and 61263606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61263637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364581 + ... + 364748.

It is an arithmetic number, because the mean of its divisors is an integer number (6807080).

Almost surely, 2^61263636 is an apocalyptic number.

It is an amenable number.

61263636 is an abundant number, since it is smaller than the sum of its proper divisors (102106284).

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

61263636 is a wasteful number, since it uses less digits than its factorization.

61263636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729343 (or 729341 counting only the distinct ones).

The product of its digits is 23328, while the sum is 33.

The square root of 61263636 is about 7827.1090448517. The cubic root of 61263636 is about 394.2160083963.

The spelling of 61263636 in words is "sixty-one million, two hundred sixty-three thousand, six hundred thirty-six".