73640287 has 6 divisors (see below), whose sum is σ = 85663248. Its totient is φ = 63120204.

The previous prime is 73640261. The next prime is 73640297. The reversal of 73640287 is 78204637.

It is not a de Polignac number, because 73640287 - 2²³ = 65251679 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 (73640297) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 751383 + ... + 751480.

It is an arithmetic number, because the mean of its divisors is an integer number (14277208).

Almost surely, 2^73640287 is an apocalyptic number.

73640287 is a deficient number, since it is larger than the sum of its proper divisors (12022961).

73640287 is a wasteful number, since it uses less digits than its factorization.

73640287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1502877 (or 1502870 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 73640287 is about 8581.3919034152. The cubic root of 73640287 is about 419.1522715768.

The spelling of 73640287 in words is "seventy-three million, six hundred forty thousand, two hundred eighty-seven".