61973604 has 144 divisors (see below), whose sum is σ = 198481920. Its totient is φ = 15837120.

The previous prime is 61973603. The next prime is 61973623. The reversal of 61973604 is 40637916.

61973604 is a `hidden beast` number, since 619 + 7 + 36 + 0 + 4 = 666.

61973604 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

61973604 is strictly pandigital in base 9.

It is not an unprimeable number, because it can be changed into a prime (61973603) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 218847 + ... + 219129.

Almost surely, 2^61973604 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61973604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99240960).

61973604 is an abundant number, since it is smaller than the sum of its proper divisors (136508316).

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

61973604 is a wasteful number, since it uses less digits than its factorization.

61973604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 61973604 is about 7872.3315478961. The cubic root of 61973604 is about 395.7329849807.

It can be divided in two parts, 6197 and 3604, that added together give a square (9801 = 99²).

The spelling of 61973604 in words is "sixty-one million, nine hundred seventy-three thousand, six hundred four".