106781428 has 18 divisors (see below), whose sum is σ = 201382454. Its totient is φ = 49249344.

The previous prime is 106781401. The next prime is 106781443. The reversal of 106781428 is 824187601.

It can be written as a sum of positive squares in 3 ways, for example, as 29833444 + 76947984 = 5462^2 + 8772^2 .

It is a super-2 number, since 2×106781428² = 22804546731438368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73800 + ... + 75232.

Almost surely, 2^106781428 is an apocalyptic number.

It is an amenable number.

106781428 is a deficient number, since it is larger than the sum of its proper divisors (94601026).

106781428 is an equidigital number, since it uses as much as digits as its factorization.

106781428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2883 (or 1448 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 106781428 is about 10333.5099554798. The cubic root of 106781428 is about 474.4224603967.

The spelling of 106781428 in words is "one hundred six million, seven hundred eighty-one thousand, four hundred twenty-eight".