77021212072 has 16 divisors (see below), whose sum is σ = 165045454560. Its totient is φ = 33009090864.

The previous prime is 77021212069. The next prime is 77021212091. The reversal of 77021212072 is 27021212077.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 687689338 + ... + 687689449.

It is an arithmetic number, because the mean of its divisors is an integer number (10315340910).

Almost surely, 2^77021212072 is an apocalyptic number.

It is an amenable number.

77021212072 is an abundant number, since it is smaller than the sum of its proper divisors (88024242488).

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

77021212072 is a wasteful number, since it uses less digits than its factorization.

77021212072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375378800 (or 1375378796 counting only the distinct ones).

The product of its (nonzero) digits is 5488, while the sum is 31.

The spelling of 77021212072 in words is "seventy-seven billion, twenty-one million, two hundred twelve thousand, seventy-two".