690745405 has 16 divisors (see below), whose sum is σ = 966643200. Its totient is φ = 473652816.

The previous prime is 690745397. The next prime is 690745469. The reversal of 690745405 is 504547096.

It is not a de Polignac number, because 690745405 - 2³ = 690745397 is a prime.

It is a super-2 number, since 2×690745405² = 954258429057228050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199669 + ... + 203098.

It is an arithmetic number, because the mean of its divisors is an integer number (60415200).

Almost surely, 2^690745405 is an apocalyptic number.

It is an amenable number.

690745405 is a deficient number, since it is larger than the sum of its proper divisors (275897795).

690745405 is an equidigital number, since it uses as much as digits as its factorization.

690745405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402793 (or 402779 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 690745405 is about 26282.0357849235. The cubic root of 690745405 is about 883.9736812493.

The spelling of 690745405 in words is "six hundred ninety million, seven hundred forty-five thousand, four hundred five".