1290729428 has 6 divisors (see below), whose sum is σ = 2258776506. Its totient is φ = 645364712.

The previous prime is 1290729373. The next prime is 1290729449. The reversal of 1290729428 is 8249270921.

It can be written as a sum of positive squares in only one way, i.e., 1184185744 + 106543684 = 34412^2 + 10322^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161341175 + ... + 161341182.

It is an arithmetic number, because the mean of its divisors is an integer number (376462751).

Almost surely, 2^1290729428 is an apocalyptic number.

It is an amenable number.

1290729428 is a deficient number, since it is larger than the sum of its proper divisors (968047078).

1290729428 is a wasteful number, since it uses less digits than its factorization.

1290729428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322682361 (or 322682359 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 1290729428 is about 35926.7230345324. The cubic root of 1290729428 is about 1088.7923746394.

The spelling of 1290729428 in words is "one billion, two hundred ninety million, seven hundred twenty-nine thousand, four hundred twenty-eight".