787380617 has 4 divisors (see below), whose sum is σ = 789717396. Its totient is φ = 785043840.

The previous prime is 787380571. The next prime is 787380641. The reversal of 787380617 is 716083787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 716083787 = 31 ⋅23099477.

It can be written as a sum of positive squares in 2 ways, for example, as 550559296 + 236821321 = 23464^2 + 15389^2 .

It is a cyclic number.

It is not a de Polignac number, because 787380617 - 2⁶ = 787380553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (787380677) 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, 1167884 + ... + 1168557.

It is an arithmetic number, because the mean of its divisors is an integer number (197429349).

Almost surely, 2^787380617 is an apocalyptic number.

It is an amenable number.

787380617 is a deficient number, since it is larger than the sum of its proper divisors (2336779).

787380617 is a wasteful number, since it uses less digits than its factorization.

787380617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2336778.

The product of its (nonzero) digits is 395136, while the sum is 47.

The square root of 787380617 is about 28060.3032235933. The cubic root of 787380617 is about 923.4107082680.

The spelling of 787380617 in words is "seven hundred eighty-seven million, three hundred eighty thousand, six hundred seventeen".