690949440 has 560 divisors, whose sum is σ = 2743931520. Its totient is φ = 164229120.

The previous prime is 690949429. The next prime is 690949451. The reversal of 690949440 is 44949096.

It is an interprime number because it is at equal distance from previous prime (690949429) and next prime (690949451).

It is a super-2 number, since 2×690949440² = 954822257272627200, which contains 22 as substring.

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 79 ways as a sum of consecutive naturals, for example, 11327010 + ... + 11327070.

Almost surely, 2^690949440 is an apocalyptic number.

690949440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690949440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1371965760).

690949440 is an abundant number, since it is smaller than the sum of its proper divisors (2052982080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

690949440 is a wasteful number, since it uses less digits than its factorization.

690949440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 690949440 is about 26285.9171420744. The cubic root of 690949440 is about 884.0607098482.

The spelling of 690949440 in words is "six hundred ninety million, nine hundred forty-nine thousand, four hundred forty".