145720840 has 32 divisors (see below), whose sum is σ = 328224960. Its totient is φ = 58225600.

The previous prime is 145720819. The next prime is 145720843. The reversal of 145720840 is 48027541.

It is not an unprimeable number, because it can be changed into a prime (145720843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59235 + ... + 61645.

It is an arithmetic number, because the mean of its divisors is an integer number (10257030).

Almost surely, 2^145720840 is an apocalyptic number.

145720840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145720840 is an abundant number, since it is smaller than the sum of its proper divisors (182504120).

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

145720840 is a wasteful number, since it uses less digits than its factorization.

145720840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3933 (or 3929 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 145720840 is about 12071.4887234342. The cubic root of 145720840 is about 526.2279224474.

The spelling of 145720840 in words is "one hundred forty-five million, seven hundred twenty thousand, eight hundred forty".