61403720 has 64 divisors (see below), whose sum is σ = 162190080. Its totient is φ = 20480256.

The previous prime is 61403669. The next prime is 61403747. The reversal of 61403720 is 2730416.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7397 + ... + 13323.

It is an arithmetic number, because the mean of its divisors is an integer number (2534220).

Almost surely, 2^61403720 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 61403720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81095040).

61403720 is an abundant number, since it is smaller than the sum of its proper divisors (100786360).

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

61403720 is a wasteful number, since it uses less digits than its factorization.

61403720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5982 (or 5978 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 61403720 is about 7836.0525776694. The cubic root of 61403720 is about 394.5162480464.

The spelling of 61403720 in words is "sixty-one million, four hundred three thousand, seven hundred twenty".