77420072 has 8 divisors (see below), whose sum is σ = 145162650. Its totient is φ = 38710032.

The previous prime is 77420071. The next prime is 77420137. The reversal of 77420072 is 27002477.

It can be written as a sum of positive squares in only one way, i.e., 67141636 + 10278436 = 8194^2 + 3206^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (77420071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4838747 + ... + 4838762.

Almost surely, 2^77420072 is an apocalyptic number.

It is an amenable number.

77420072 is a deficient number, since it is larger than the sum of its proper divisors (67742578).

77420072 is a wasteful number, since it uses less digits than its factorization.

77420072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9677515 (or 9677511 counting only the distinct ones).

The product of its (nonzero) digits is 5488, while the sum is 29.

The square root of 77420072 is about 8798.8676544201. The cubic root of 77420072 is about 426.2043293775.

The spelling of 77420072 in words is "seventy-seven million, four hundred twenty thousand, seventy-two".