7451881920 has 168 divisors, whose sum is σ = 29293072224. Its totient is φ = 1703282688.

The previous prime is 7451881919. The next prime is 7451881933. The reversal of 7451881920 is 291881547.

7451881920 is a `hidden beast` number, since 7 + 451 + 8 + 8 + 192 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 164659 + ... + 204978.

Almost surely, 2^7451881920 is an apocalyptic number.

7451881920 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7451881920 is an abundant number, since it is smaller than the sum of its proper divisors (21841190304).

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

7451881920 is a wasteful number, since it uses less digits than its factorization.

7451881920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369667 (or 369654 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The square root of 7451881920 is about 86324.2834896415. The cubic root of 7451881920 is about 1953.2387047258.

The spelling of 7451881920 in words is "seven billion, four hundred fifty-one million, eight hundred eighty-one thousand, nine hundred twenty".