61494840 has 192 divisors, whose sum is σ = 222899040. Its totient is φ = 14576640.

The previous prime is 61494827. The next prime is 61494841. The reversal of 61494840 is 4849416.

It is a happy number.

61494840 is digitally balanced in base 2, 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).

It is a junction number, because it is equal to n+sod(n) for n = 61494795 and 61494804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61494841) 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 47 ways as a sum of consecutive naturals, for example, 209734 + ... + 210026.

Almost surely, 2^61494840 is an apocalyptic number.

61494840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61494840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111449520).

61494840 is an abundant number, since it is smaller than the sum of its proper divisors (161404200).

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

61494840 is a wasteful number, since it uses less digits than its factorization.

61494840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374 (or 367 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 61494840 is about 7841.8645741941. The cubic root of 61494840 is about 394.7112989507.

The spelling of 61494840 in words is "sixty-one million, four hundred ninety-four thousand, eight hundred forty".