61428209868 has 24 divisors (see below), whose sum is σ = 159258322160. Its totient is φ = 20476069920.

The previous prime is 61428209839. The next prime is 61428209881. The reversal of 61428209868 is 86890282416.

61428209868 is a `hidden beast` number, since 6 + 1 + 428 + 209 + 8 + 6 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284389753 + ... + 284389968.

Almost surely, 2^61428209868 is an apocalyptic number.

It is an amenable number.

61428209868 is an abundant number, since it is smaller than the sum of its proper divisors (97830112292).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61428209868 is a wasteful number, since it uses less digits than its factorization.

61428209868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568779734 (or 568779726 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 54.

The spelling of 61428209868 in words is "sixty-one billion, four hundred twenty-eight million, two hundred nine thousand, eight hundred sixty-eight".