87478773 has 4 divisors (see below), whose sum is σ = 116638368. Its totient is φ = 58319180.

The previous prime is 87478739. The next prime is 87478799. The reversal of 87478773 is 37787478.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87478773 - 2¹⁶ = 87413237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87478273) 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, 14579793 + ... + 14579798.

It is an arithmetic number, because the mean of its divisors is an integer number (29159592).

Almost surely, 2^87478773 is an apocalyptic number.

It is an amenable number.

87478773 is a deficient number, since it is larger than the sum of its proper divisors (29159595).

87478773 is a wasteful number, since it uses less digits than its factorization.

87478773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29159594.

The product of its digits is 1843968, while the sum is 51.

The square root of 87478773 is about 9353.0087672363. The cubic root of 87478773 is about 443.9160978950.

The spelling of 87478773 in words is "eighty-seven million, four hundred seventy-eight thousand, seven hundred seventy-three".