61728406835 has 64 divisors (see below), whose sum is σ = 82461722112. Its totient is φ = 44166076416.

The previous prime is 61728406787. The next prime is 61728406841. The reversal of 61728406835 is 53860482716.

It is a cyclic number.

It is not a de Polignac number, because 61728406835 - 2⁶ = 61728406771 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20323937 + ... + 20326973.

It is an arithmetic number, because the mean of its divisors is an integer number (1288464408).

Almost surely, 2^61728406835 is an apocalyptic number.

61728406835 is a deficient number, since it is larger than the sum of its proper divisors (20733315277).

61728406835 is a wasteful number, since it uses less digits than its factorization.

61728406835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3252.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 61728406835 in words is "sixty-one billion, seven hundred twenty-eight million, four hundred six thousand, eight hundred thirty-five".