61728450679 has 16 divisors (see below), whose sum is σ = 71289334080. Its totient is φ = 52353849600.

The previous prime is 61728450673. The next prime is 61728450683. The reversal of 61728450679 is 97605482716.

It is a cyclic number.

It is not a de Polignac number, because 61728450679 - 2³ = 61728450671 is a prime.

It is a super-2 number, since 2×61728450679² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61728450671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1153827 + ... + 1206139.

It is an arithmetic number, because the mean of its divisors is an integer number (4455583380).

Almost surely, 2^61728450679 is an apocalyptic number.

61728450679 is a deficient number, since it is larger than the sum of its proper divisors (9560883401).

61728450679 is a wasteful number, since it uses less digits than its factorization.

61728450679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54090.

The product of its (nonzero) digits is 5080320, while the sum is 55.

The spelling of 61728450679 in words is "sixty-one billion, seven hundred twenty-eight million, four hundred fifty thousand, six hundred seventy-nine".