1264517990 has 16 divisors (see below), whose sum is σ = 2319079248. Its totient is φ = 496263456.

The previous prime is 1264517971. The next prime is 1264517999. The reversal of 1264517990 is 997154621.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264517999) 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, 1192412 + ... + 1193471.

It is an arithmetic number, because the mean of its divisors is an integer number (144942453).

Almost surely, 2^1264517990 is an apocalyptic number.

1264517990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1264517990 is a deficient number, since it is larger than the sum of its proper divisors (1054561258).

1264517990 is a wasteful number, since it uses less digits than its factorization.

1264517990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2385943.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 1264517990 is about 35560.0617266056. The cubic root of 1264517990 is about 1081.3717109808.

The spelling of 1264517990 in words is "one billion, two hundred sixty-four million, five hundred seventeen thousand, nine hundred ninety".