99978545 has 8 divisors (see below), whose sum is σ = 120890880. Its totient is φ = 79371760.

The previous prime is 99978533. The next prime is 99978559. The reversal of 99978545 is 54587999.

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

It is not a de Polignac number, because 99978545 - 2²⁴ = 83201329 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75665 + ... + 76974.

It is an arithmetic number, because the mean of its divisors is an integer number (15111360).

Almost surely, 2^99978545 is an apocalyptic number.

It is an amenable number.

99978545 is a deficient number, since it is larger than the sum of its proper divisors (20912335).

99978545 is a wasteful number, since it uses less digits than its factorization.

99978545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152775.

The product of its digits is 4082400, while the sum is 56.

The square root of 99978545 is about 9998.9271924542. The cubic root of 99978545 is about 464.1256858909.

The spelling of 99978545 in words is "ninety-nine million, nine hundred seventy-eight thousand, five hundred forty-five".