1256761464 has 32 divisors (see below), whose sum is σ = 3590747520. Its totient is φ = 359074656.

The previous prime is 1256761447. The next prime is 1256761501. The reversal of 1256761464 is 4641676521.

It is a super-3 number, since 3×1256761464³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

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, 3740194 + ... + 3740529.

It is an arithmetic number, because the mean of its divisors is an integer number (112210860).

Almost surely, 2^1256761464 is an apocalyptic number.

1256761464 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1256761464 is an abundant number, since it is smaller than the sum of its proper divisors (2333986056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1256761464 is a wasteful number, since it uses less digits than its factorization.

1256761464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7480739 (or 7480735 counting only the distinct ones).

The product of its digits is 241920, while the sum is 42.

The square root of 1256761464 is about 35450.8316404566. The cubic root of 1256761464 is about 1079.1561377989.

The spelling of 1256761464 in words is "one billion, two hundred fifty-six million, seven hundred sixty-one thousand, four hundred sixty-four".