677022042978 has 18 divisors (see below), whose sum is σ = 1466888656779. Its totient is φ = 225672850692.

The previous prime is 677022042973. The next prime is 677022043013. The reversal of 677022042978 is 879240220776.

It is a happy number.

677022042978 is a `hidden beast` number, since 67 + 70 + 2 + 20 + 429 + 78 = 666.

It can be written as a sum of positive squares in only one way, i.e., 338511021489 + 338511021489 = 581817^2 + 581817^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=581817.

It is not an unprimeable number, because it can be changed into a prime (677022042973) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3393933 + ... + 3587871.

Almost surely, 2^677022042978 is an apocalyptic number.

677022042978 is an abundant number, since it is smaller than the sum of its proper divisors (789866613801).

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

677022042978 is an frugal number, since it uses more digits than its factorization.

677022042978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387886 (or 193944 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 54.

The spelling of 677022042978 in words is "six hundred seventy-seven billion, twenty-two million, forty-two thousand, nine hundred seventy-eight".