1264155890 has 16 divisors (see below), whose sum is σ = 2278935000. Its totient is φ = 504894720.

The previous prime is 1264155869. The next prime is 1264155917. The reversal of 1264155890 is 985514621.

It can be written as a sum of positive squares in 4 ways, for example, as 1161923569 + 102232321 = 34087^2 + 10111^2 .

It is a super-2 number, since 2×1264155890² = 3196180228443384200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89015 + ... + 102234.

Almost surely, 2^1264155890 is an apocalyptic number.

1264155890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1264155890 is a deficient number, since it is larger than the sum of its proper divisors (1014779110).

1264155890 is a wasteful number, since it uses less digits than its factorization.

1264155890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191917.

The product of its (nonzero) digits is 86400, while the sum is 41.

The square root of 1264155890 is about 35554.9699760807. The cubic root of 1264155890 is about 1081.2684826938.

The spelling of 1264155890 in words is "one billion, two hundred sixty-four million, one hundred fifty-five thousand, eight hundred ninety".