84691690 has 32 divisors (see below), whose sum is σ = 158008320. Its totient is φ = 32649600.

The previous prime is 84691669. The next prime is 84691699. The reversal of 84691690 is 9619648.

It is a super-2 number, since 2×84691690² = 14345364710112200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (84691699) 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, 110910 + ... + 111670.

It is an arithmetic number, because the mean of its divisors is an integer number (4937760).

Almost surely, 2^84691690 is an apocalyptic number.

84691690 is a deficient number, since it is larger than the sum of its proper divisors (73316630).

84691690 is a wasteful number, since it uses less digits than its factorization.

84691690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 84691690 is about 9202.8088103578. The cubic root of 84691690 is about 439.1507206076.

It can be divided in two parts, 846 and 91690, that multiplied together give a triangular number (77569740 = T₁₂₄₅₅).

The spelling of 84691690 in words is "eighty-four million, six hundred ninety-one thousand, six hundred ninety".