685670401 has 8 divisors (see below), whose sum is σ = 781850664. Its totient is φ = 595695360.

The previous prime is 685670383. The next prime is 685670407. The reversal of 685670401 is 104076586.

It can be written as a sum of positive squares in 4 ways, for example, as 1324801 + 684345600 = 1151^2 + 26160^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 685670401 - 2¹⁷ = 685539329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685670407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1551070 + ... + 1551511.

It is an arithmetic number, because the mean of its divisors is an integer number (97731333).

It is a Proth number, since it is equal to 20925 ⋅ 2¹⁵ + 1 and 20925 < 2¹⁵.

Almost surely, 2^685670401 is an apocalyptic number.

It is an amenable number.

685670401 is a deficient number, since it is larger than the sum of its proper divisors (96180263).

685670401 is a wasteful number, since it uses less digits than its factorization.

685670401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3102611.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 685670401 is about 26185.3088773075. The cubic root of 685670401 is about 881.8034644355.

The spelling of 685670401 in words is "six hundred eighty-five million, six hundred seventy thousand, four hundred one".