691672 has 16 divisors (see below), whose sum is σ = 1339200. Its totient is φ = 334560.

The previous prime is 691661. The next prime is 691681. The reversal of 691672 is 276196.

691672 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

691672 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1147 + ... + 1642.

It is an arithmetic number, because the mean of its divisors is an integer number (83700).

2⁶⁹¹⁶⁷² is an apocalyptic number.

691672 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

691672 is a deficient number, since it is larger than the sum of its proper divisors (647528).

691672 is a wasteful number, since it uses less digits than its factorization.

691672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2826 (or 2822 counting only the distinct ones).

The product of its digits is 4536, while the sum is 31.

The square root of 691672 is about 831.6682030714. The cubic root of 691672 is about 88.4368771157.

It can be divided in two parts, 69167 and 2, that added together give a square (69169 = 263²).

The spelling of 691672 in words is "six hundred ninety-one thousand, six hundred seventy-two".