61173840 has 160 divisors (see below), whose sum is σ = 233485056. Its totient is φ = 12902400.

The previous prime is 61173823. The next prime is 61173851. The reversal of 61173840 is 4837116.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 61173798 and 61173807.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 20440 + ... + 23240.

Almost surely, 2^61173840 is an apocalyptic number.

61173840 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 61173840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116742528).

61173840 is an abundant number, since it is smaller than the sum of its proper divisors (172311216).

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

61173840 is a wasteful number, since it uses less digits than its factorization.

61173840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2837 (or 2831 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 61173840 is about 7821.3707238565. The cubic root of 61173840 is about 394.0233093650.

The spelling of 61173840 in words is "sixty-one million, one hundred seventy-three thousand, eight hundred forty".