102689690 has 16 divisors (see below), whose sum is σ = 195714792. Its totient is φ = 38659584.

The previous prime is 102689681. The next prime is 102689693. The reversal of 102689690 is 96986201.

It can be written as a sum of positive squares in 4 ways, for example, as 95394289 + 7295401 = 9767^2 + 2701^2 .

It is a super-2 number, since 2×102689690² = 21090344864592200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (102689693) 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, 301859 + ... + 302198.

Almost surely, 2^102689690 is an apocalyptic number.

102689690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

102689690 is a deficient number, since it is larger than the sum of its proper divisors (93025102).

102689690 is a wasteful number, since it uses less digits than its factorization.

102689690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604081.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 102689690 is about 10133.5921567823. The cubic root of 102689690 is about 468.2835991423.

The spelling of 102689690 in words is "one hundred two million, six hundred eighty-nine thousand, six hundred ninety".