99977807 has 4 divisors (see below), whose sum is σ = 101347440. Its totient is φ = 98608176.

The previous prime is 99977797. The next prime is 99977827. The reversal of 99977807 is 70877999.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99977807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99977827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 684707 + ... + 684852.

It is an arithmetic number, because the mean of its divisors is an integer number (25336860).

Almost surely, 2^99977807 is an apocalyptic number.

99977807 is a deficient number, since it is larger than the sum of its proper divisors (1369633).

99977807 is a wasteful number, since it uses less digits than its factorization.

99977807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369632.

The product of its (nonzero) digits is 2000376, while the sum is 56.

The square root of 99977807 is about 9998.8902884270. The cubic root of 99977807 is about 464.1245438938.

The spelling of 99977807 in words is "ninety-nine million, nine hundred seventy-seven thousand, eight hundred seven".