61783904 has 96 divisors (see below), whose sum is σ = 153115200. Its totient is φ = 24385536.

The previous prime is 61783903. The next prime is 61783907. The reversal of 61783904 is 40938716.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61783903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142472 + ... + 142904.

It is an arithmetic number, because the mean of its divisors is an integer number (1594950).

Almost surely, 2^61783904 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 61783904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76557600).

61783904 is an abundant number, since it is smaller than the sum of its proper divisors (91331296).

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

61783904 is a wasteful number, since it uses less digits than its factorization.

61783904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 455 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 61783904 is about 7860.2737865802. The cubic root of 61783904 is about 395.3287952966.

The spelling of 61783904 in words is "sixty-one million, seven hundred eighty-three thousand, nine hundred four".