690680451 has 4 divisors (see below), whose sum is σ = 920907272. Its totient is φ = 460453632.

The previous prime is 690680429. The next prime is 690680467. The reversal of 690680451 is 154086096.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 690680451 - 2¹¹ = 690678403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690680401) 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, 115113406 + ... + 115113411.

It is an arithmetic number, because the mean of its divisors is an integer number (230226818).

Almost surely, 2^690680451 is an apocalyptic number.

690680451 is a deficient number, since it is larger than the sum of its proper divisors (230226821).

690680451 is a wasteful number, since it uses less digits than its factorization.

690680451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230226820.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 690680451 is about 26280.8000448997. The cubic root of 690680451 is about 883.9459723299.

The spelling of 690680451 in words is "six hundred ninety million, six hundred eighty thousand, four hundred fifty-one".