145991604 has 24 divisors (see below), whose sum is σ = 371615328. Its totient is φ = 44239840.

The previous prime is 145991591. The next prime is 145991621. The reversal of 145991604 is 406199541.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 552867 + ... + 553130.

It is an arithmetic number, because the mean of its divisors is an integer number (15483972).

Almost surely, 2^145991604 is an apocalyptic number.

It is an amenable number.

145991604 is an abundant number, since it is smaller than the sum of its proper divisors (225623724).

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

145991604 is a wasteful number, since it uses less digits than its factorization.

145991604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106015 (or 1106013 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 145991604 is about 12082.6985396475. The cubic root of 145991604 is about 526.5536489497.

The spelling of 145991604 in words is "one hundred forty-five million, nine hundred ninety-one thousand, six hundred four".