690978153 has 4 divisors (see below), whose sum is σ = 921304208. Its totient is φ = 460652100.

The previous prime is 690978139. The next prime is 690978173. The reversal of 690978153 is 351879096.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 690978153 - 2⁹ = 690977641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690978173) 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, 115163023 + ... + 115163028.

It is an arithmetic number, because the mean of its divisors is an integer number (230326052).

Almost surely, 2^690978153 is an apocalyptic number.

It is an amenable number.

690978153 is a deficient number, since it is larger than the sum of its proper divisors (230326055).

690978153 is a wasteful number, since it uses less digits than its factorization.

690978153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230326054.

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 690978153 is about 26286.4633033811. The cubic root of 690978153 is about 884.0729556470.

The spelling of 690978153 in words is "six hundred ninety million, nine hundred seventy-eight thousand, one hundred fifty-three".