61878572 has 60 divisors (see below), whose sum is σ = 134111880. Its totient is φ = 24893568.

The previous prime is 61878571. The next prime is 61878577. The reversal of 61878572 is 27587816.

It is not an unprimeable number, because it can be changed into a prime (61878571) 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 19 ways as a sum of consecutive naturals, for example, 163079 + ... + 163457.

It is an arithmetic number, because the mean of its divisors is an integer number (2235198).

Almost surely, 2^61878572 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 61878572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67055940).

61878572 is an abundant number, since it is smaller than the sum of its proper divisors (72233308).

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

61878572 is a wasteful number, since it uses less digits than its factorization.

61878572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428 (or 405 counting only the distinct ones).

The product of its digits is 188160, while the sum is 44.

The square root of 61878572 is about 7866.2934092239. The cubic root of 61878572 is about 395.5306056144.

The spelling of 61878572 in words is "sixty-one million, eight hundred seventy-eight thousand, five hundred seventy-two".