61728379456 has 14 divisors (see below), whose sum is σ = 122492253110. Its totient is φ = 30864189696.

The previous prime is 61728379439. The next prime is 61728379469. The reversal of 61728379456 is 65497382716.

It can be written as a sum of positive squares in only one way, i.e., 44876185600 + 16852193856 = 211840^2 + 129816^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61728379456.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 482252901 + ... + 482253028.

Almost surely, 2^61728379456 is an apocalyptic number.

It is an amenable number.

61728379456 is a deficient number, since it is larger than the sum of its proper divisors (60763873654).

61728379456 is an equidigital number, since it uses as much as digits as its factorization.

61728379456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964505941 (or 964505931 counting only the distinct ones).

The product of its digits is 15240960, while the sum is 58.

The spelling of 61728379456 in words is "sixty-one billion, seven hundred twenty-eight million, three hundred seventy-nine thousand, four hundred fifty-six".