61896640 has 56 divisors (see below), whose sum is σ = 158739840. Its totient is φ = 22852608.

The previous prime is 61896629. The next prime is 61896641. The reversal of 61896640 is 4669816.

61896640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 61896593 and 61896602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61896641) by changing a digit.

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, 3280 + ... + 11599.

It is an arithmetic number, because the mean of its divisors is an integer number (2834640).

Almost surely, 2^61896640 is an apocalyptic number.

It is an amenable number.

61896640 is an abundant number, since it is smaller than the sum of its proper divisors (96843200).

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

61896640 is a wasteful number, since it uses less digits than its factorization.

61896640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14909 (or 14899 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 61896640 is about 7867.4417697241. The cubic root of 61896640 is about 395.5690990233.

The spelling of 61896640 in words is "sixty-one million, eight hundred ninety-six thousand, six hundred forty".