61722789 has 8 divisors (see below), whose sum is σ = 83646432. Its totient is φ = 40473840.

The previous prime is 61722769. The next prime is 61722809. The reversal of 61722789 is 98722716.

It is an interprime number because it is at equal distance from previous prime (61722769) and next prime (61722809).

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

It is not a de Polignac number, because 61722789 - 2⁹ = 61722277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61722789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61722709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168459 + ... + 168824.

It is an arithmetic number, because the mean of its divisors is an integer number (10455804).

Almost surely, 2^61722789 is an apocalyptic number.

It is an amenable number.

61722789 is a deficient number, since it is larger than the sum of its proper divisors (21923643).

61722789 is a wasteful number, since it uses less digits than its factorization.

61722789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337347.

The product of its digits is 84672, while the sum is 42.

The square root of 61722789 is about 7856.3852374995. The cubic root of 61722789 is about 395.1984027053.

The spelling of 61722789 in words is "sixty-one million, seven hundred twenty-two thousand, seven hundred eighty-nine".