77995007 has 4 divisors (see below), whose sum is σ = 80684520. Its totient is φ = 75305496.

The previous prime is 77995003. The next prime is 77995009. The reversal of 77995007 is 70059977.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77995007 - 2² = 77995003 is a prime.

It is a super-2 number, since 2×77995007² = 12166442233860098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77995003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1344713 + ... + 1344770.

It is an arithmetic number, because the mean of its divisors is an integer number (20171130).

Almost surely, 2^77995007 is an apocalyptic number.

77995007 is a deficient number, since it is larger than the sum of its proper divisors (2689513).

77995007 is a wasteful number, since it uses less digits than its factorization.

77995007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2689512.

The product of its (nonzero) digits is 138915, while the sum is 44.

The square root of 77995007 is about 8831.4781888425. The cubic root of 77995007 is about 427.2567511441.

The spelling of 77995007 in words is "seventy-seven million, nine hundred ninety-five thousand, seven".