145721610 has 48 divisors (see below), whose sum is σ = 379739880. Its totient is φ = 38770560.

The previous prime is 145721599. The next prime is 145721617. The reversal of 145721610 is 16127541.

It is a happy number.

145721610 is a `hidden beast` number, since 1 + 45 + 7 + 2 + 1 + 610 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 106069401 + 39652209 = 10299^2 + 6297^2 .

It is not an unprimeable number, because it can be changed into a prime (145721617) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44220 + ... + 47400.

Almost surely, 2^145721610 is an apocalyptic number.

145721610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

145721610 is the 7635-th heptagonal number.

145721610 is an abundant number, since it is smaller than the sum of its proper divisors (234018270).

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

145721610 is a wasteful number, since it uses less digits than its factorization.

145721610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3703 (or 3700 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 145721610 is about 12071.5206167243. The cubic root of 145721610 is about 526.2288493219.

The spelling of 145721610 in words is "one hundred forty-five million, seven hundred twenty-one thousand, six hundred ten".