99978004 has 12 divisors (see below), whose sum is σ = 199956064. Its totient is φ = 42847704.

The previous prime is 99978001. The next prime is 99978017. The reversal of 99978004 is 40087999.

99978004 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99978001) 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, 1785294 + ... + 1785349.

Almost surely, 2^99978004 is an apocalyptic number.

It is an amenable number.

99978004 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99978004 is a wasteful number, since it uses less digits than its factorization.

99978004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3570654 (or 3570652 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 99978004 is about 9998.9001395153. The cubic root of 99978004 is about 464.1248487364.

It can be divided in two parts, 999 and 78004, that added together give a triangular number (79003 = T₃₉₇).

The spelling of 99978004 in words is "ninety-nine million, nine hundred seventy-eight thousand, four".