85780915 has 64 divisors (see below), whose sum is σ = 127733760. Its totient is φ = 54552960.

The previous prime is 85780909. The next prime is 85780949. The reversal of 85780915 is 51908758.

It is not a de Polignac number, because 85780915 - 2¹³ = 85772723 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1033464 + ... + 1033546.

It is an arithmetic number, because the mean of its divisors is an integer number (1995840).

Almost surely, 2^85780915 is an apocalyptic number.

85780915 is a deficient number, since it is larger than the sum of its proper divisors (41952845).

85780915 is a wasteful number, since it uses less digits than its factorization.

85780915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184.

The product of its (nonzero) digits is 100800, while the sum is 43.

The square root of 85780915 is about 9261.7986913990. The cubic root of 85780915 is about 441.0253549181.

The spelling of 85780915 in words is "eighty-five million, seven hundred eighty thousand, nine hundred fifteen".