99990607 has 4 divisors (see below), whose sum is σ = 101021536. Its totient is φ = 98959680.

The previous prime is 99990589. The next prime is 99990641. The reversal of 99990607 is 70609999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70609999 = 43 ⋅1642093.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99990607 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 (99990647) 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, 515319 + ... + 515512.

It is an arithmetic number, because the mean of its divisors is an integer number (25255384).

Almost surely, 2^99990607 is an apocalyptic number.

99990607 is a gapful number since it is divisible by the number (97) formed by its first and last digit.

99990607 is a deficient number, since it is larger than the sum of its proper divisors (1030929).

99990607 is a wasteful number, since it uses less digits than its factorization.

99990607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030928.

The product of its (nonzero) digits is 275562, while the sum is 49.

The square root of 99990607 is about 9999.5303389709. The cubic root of 99990607 is about 464.1443500916.

The spelling of 99990607 in words is "ninety-nine million, nine hundred ninety thousand, six hundred seven".