61678420 has 24 divisors (see below), whose sum is σ = 130864104. Its totient is φ = 24416256.

The previous prime is 61678411. The next prime is 61678457. The reversal of 61678420 is 2487616.

61678420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 10355524 + 51322896 = 3218^2 + 7164^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13957 + ... + 17836.

It is an arithmetic number, because the mean of its divisors is an integer number (5452671).

Almost surely, 2^61678420 is an apocalyptic number.

It is an amenable number.

61678420 is an abundant number, since it is smaller than the sum of its proper divisors (69185684).

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

61678420 is a wasteful number, since it uses less digits than its factorization.

61678420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31899 (or 31897 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 61678420 is about 7853.5609757613. The cubic root of 61678420 is about 395.1036847930.

The spelling of 61678420 in words is "sixty-one million, six hundred seventy-eight thousand, four hundred twenty".