77972506 has 8 divisors (see below), whose sum is σ = 123838740. Its totient is φ = 36692928.

The previous prime is 77972497. The next prime is 77972509. The reversal of 77972506 is 60527977.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 76125625 + 1846881 = 8725^2 + 1359^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (77972509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1146621 + ... + 1146688.

Almost surely, 2^77972506 is an apocalyptic number.

77972506 is a deficient number, since it is larger than the sum of its proper divisors (45866234).

77972506 is a wasteful number, since it uses less digits than its factorization.

77972506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2293328.

The product of its (nonzero) digits is 185220, while the sum is 43.

The square root of 77972506 is about 8830.2041878996. The cubic root of 77972506 is about 427.2156603565.

The spelling of 77972506 in words is "seventy-seven million, nine hundred seventy-two thousand, five hundred six".