7655991 has 8 divisors (see below), whose sum is σ = 11666304. Its totient is φ = 4374840.

The previous prime is 7655953. The next prime is 7656007. The reversal of 7655991 is 1995567.

7655991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 7655991 - 2¹⁴ = 7639607 is a prime.

It is a super-2 number, since 2×7655991² = 117228396384162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7655891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182265 + ... + 182306.

It is an arithmetic number, because the mean of its divisors is an integer number (1458288).

Almost surely, 2^7655991 is an apocalyptic number.

7655991 is a deficient number, since it is larger than the sum of its proper divisors (4010313).

7655991 is a wasteful number, since it uses less digits than its factorization.

7655991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364581.

The product of its digits is 85050, while the sum is 42.

The square root of 7655991 is about 2766.9461505421. The cubic root of 7655991 is about 197.0911565901.

It can be divided in two parts, 7655 and 991, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 7655991 in words is "seven million, six hundred fifty-five thousand, nine hundred ninety-one".