690978 has 8 divisors (see below), whose sum is σ = 1381968. Its totient is φ = 230324.

The previous prime is 690953. The next prime is 690997. The reversal of 690978 is 879096.

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

690978 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57576 + ... + 57587.

It is an arithmetic number, because the mean of its divisors is an integer number (172746).

2⁶⁹⁰⁹⁷⁸ is an apocalyptic number.

690978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

690978 is a wasteful number, since it uses less digits than its factorization.

690978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115168.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 690978 is about 831.2508646612. The cubic root of 690978 is about 88.4072890395.

The spelling of 690978 in words is "six hundred ninety thousand, nine hundred seventy-eight".