7825661 has 8 divisors (see below), whose sum is σ = 8392320. Its totient is φ = 7270848.

The previous prime is 7825651. The next prime is 7825687. The reversal of 7825661 is 1665287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7825661 is a prime.

It is a super-2 number, since 2×7825661² = 122481940173842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7825651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1571 + ... + 4256.

It is an arithmetic number, because the mean of its divisors is an integer number (1049040).

Almost surely, 2^7825661 is an apocalyptic number.

It is an amenable number.

7825661 is a deficient number, since it is larger than the sum of its proper divisors (566659).

7825661 is a wasteful number, since it uses less digits than its factorization.

7825661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5923.

The product of its digits is 20160, while the sum is 35.

The square root of 7825661 is about 2797.4382924383. The cubic root of 7825661 is about 198.5364918412.

The spelling of 7825661 in words is "seven million, eight hundred twenty-five thousand, six hundred sixty-one".