84646639 has 36 divisors (see below), whose sum is σ = 110781552. Its totient is φ = 63296640.

The previous prime is 84646619. The next prime is 84646657. The reversal of 84646639 is 93664648.

It is not a de Polignac number, because 84646639 - 2⁵ = 84646607 is a prime.

Its product of digits (746496) is a multiple of the sum of its prime divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84646619) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1159507 + ... + 1159579.

Almost surely, 2^84646639 is an apocalyptic number.

84646639 is a deficient number, since it is larger than the sum of its proper divisors (26134913).

84646639 is a wasteful number, since it uses less digits than its factorization.

84646639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 128 counting only the distinct ones).

The product of its digits is 746496, while the sum is 46.

The square root of 84646639 is about 9200.3608081423. The cubic root of 84646639 is about 439.0728393415.

Subtracting 84646639 from its reverse (93664648), we obtain a square (9018009 = 3003²).

The spelling of 84646639 in words is "eighty-four million, six hundred forty-six thousand, six hundred thirty-nine".