61790721 has 8 divisors (see below), whose sum is σ = 82618560. Its totient is φ = 41078352.

The previous prime is 61790711. The next prime is 61790723. The reversal of 61790721 is 12709716.

61790721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61790721 - 2⁷ = 61790593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61790723) 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, 27610 + ... + 29763.

It is an arithmetic number, because the mean of its divisors is an integer number (10327320).

Almost surely, 2^61790721 is an apocalyptic number.

It is an amenable number.

61790721 is a deficient number, since it is larger than the sum of its proper divisors (20827839).

61790721 is a wasteful number, since it uses less digits than its factorization.

61790721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57735.

The product of its (nonzero) digits is 5292, while the sum is 33.

The square root of 61790721 is about 7860.7074109141. The cubic root of 61790721 is about 395.3433344516.

The spelling of 61790721 in words is "sixty-one million, seven hundred ninety thousand, seven hundred twenty-one".