254615640 has 32 divisors (see below), whose sum is σ = 763847280. Its totient is φ = 67897472.

The previous prime is 254615639. The next prime is 254615653. The reversal of 254615640 is 46516452.

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, 1060779 + ... + 1061018.

Almost surely, 2^254615640 is an apocalyptic number.

254615640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

254615640 is an abundant number, since it is smaller than the sum of its proper divisors (509231640).

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

254615640 is a wasteful number, since it uses less digits than its factorization.

254615640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121811 (or 2121807 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 254615640 is about 15956.6801058366. The cubic root of 254615640 is about 633.8138022278.

It can be divided in two parts, 254615 and 640, that added together give a triangular number (255255 = T₇₁₄).

The spelling of 254615640 in words is "two hundred fifty-four million, six hundred fifteen thousand, six hundred forty".