690971445 has 16 divisors (see below), whose sum is σ = 1228393920. Its totient is φ = 368518032.

The previous prime is 690971399. The next prime is 690971467. The reversal of 690971445 is 544179096.

It is not a de Polignac number, because 690971445 - 2⁷ = 690971317 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 690971445.

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, 2559019 + ... + 2559288.

It is an arithmetic number, because the mean of its divisors is an integer number (76774620).

Almost surely, 2^690971445 is an apocalyptic number.

It is an amenable number.

690971445 is a deficient number, since it is larger than the sum of its proper divisors (537422475).

690971445 is a wasteful number, since it uses less digits than its factorization.

690971445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5118321 (or 5118315 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 690971445 is about 26286.3357088811. The cubic root of 690971445 is about 884.0700947845.

The spelling of 690971445 in words is "six hundred ninety million, nine hundred seventy-one thousand, four hundred forty-five".