61201638 has 12 divisors (see below), whose sum is σ = 132603588. Its totient is φ = 20400540.

The previous prime is 61201631. The next prime is 61201669. The reversal of 61201638 is 83610216.

61201638 is a `hidden beast` number, since 6 + 1 + 20 + 1 + 638 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61201631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1700028 + ... + 1700063.

It is an arithmetic number, because the mean of its divisors is an integer number (11050299).

Almost surely, 2^61201638 is an apocalyptic number.

61201638 is an abundant number, since it is smaller than the sum of its proper divisors (71401950).

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

61201638 is a wasteful number, since it uses less digits than its factorization.

61201638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3400099 (or 3400096 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 61201638 is about 7823.1475762637. The cubic root of 61201638 is about 394.0829830279.

The spelling of 61201638 in words is "sixty-one million, two hundred one thousand, six hundred thirty-eight".