82619409 has 16 divisors (see below), whose sum is σ = 113839488. Its totient is φ = 53258112.

The previous prime is 82619401. The next prime is 82619417. The reversal of 82619409 is 90491628.

It is an interprime number because it is at equal distance from previous prime (82619401) and next prime (82619417).

It is not a de Polignac number, because 82619409 - 2³ = 82619401 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (82619401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16309 + ... + 20765.

It is an arithmetic number, because the mean of its divisors is an integer number (7114968).

Almost surely, 2^82619409 is an apocalyptic number.

It is an amenable number.

82619409 is a deficient number, since it is larger than the sum of its proper divisors (31220079).

82619409 is a wasteful number, since it uses less digits than its factorization.

82619409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4664.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 82619409 is about 9089.5219346234. The cubic root of 82619409 is about 435.5393125879.

It can be divided in two parts, 82619 and 409, that added together give a triangular number (83028 = T₄₀₇).

The spelling of 82619409 in words is "eighty-two million, six hundred nineteen thousand, four hundred nine".