690678045 has 24 divisors (see below), whose sum is σ = 1208372256. Its totient is φ = 364916448.

The previous prime is 690678031. The next prime is 690678061. The reversal of 690678045 is 540876096.

690678045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 690678045 - 2⁸ = 690677789 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66907 + ... + 76536.

It is an arithmetic number, because the mean of its divisors is an integer number (50348844).

Almost surely, 2^690678045 is an apocalyptic number.

It is an amenable number.

690678045 is a deficient number, since it is larger than the sum of its proper divisors (517694211).

690678045 is a wasteful number, since it uses less digits than its factorization.

690678045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143561 (or 143558 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 690678045 is about 26280.7542699977. The cubic root of 690678045 is about 883.9449459138.

The spelling of 690678045 in words is "six hundred ninety million, six hundred seventy-eight thousand, forty-five".