145697720 has 32 divisors (see below), whose sum is σ = 374652000. Its totient is φ = 49953408.

The previous prime is 145697683. The next prime is 145697729. The reversal of 145697720 is 27796541.

It is a super-2 number, since 2×145697720² = 42455651226396800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145697729) 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, 259895 + ... + 260454.

It is an arithmetic number, because the mean of its divisors is an integer number (11707875).

Almost surely, 2^145697720 is an apocalyptic number.

145697720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145697720 is an abundant number, since it is smaller than the sum of its proper divisors (228954280).

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

145697720 is a wasteful number, since it uses less digits than its factorization.

145697720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520367 (or 520363 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 145697720 is about 12070.5310570828. The cubic root of 145697720 is about 526.2000906172.

The spelling of 145697720 in words is "one hundred forty-five million, six hundred ninety-seven thousand, seven hundred twenty".