64590154240 has 60 divisors (see below), whose sum is σ = 154895824314. Its totient is φ = 25830918144.

The previous prime is 64590154201. The next prime is 64590154249. The reversal of 64590154240 is 4245109546.

It can be written as a sum of positive squares in only one way, i.e., 58131138816 + 6459015424 = 241104^2 + 80368^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 64590154193 and 64590154202.

It is not an unprimeable number, because it can be changed into a prime (64590154249) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12856369 + ... + 12861391.

Almost surely, 2^64590154240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64590154240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77447912157).

64590154240 is an abundant number, since it is smaller than the sum of its proper divisors (90305670074).

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

64590154240 is an frugal number, since it uses more digits than its factorization.

64590154240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10069 (or 5030 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

Multiplying 64590154240 by its sum of digits (40), we get a square (2583606169600 = 1607360²).

64590154240 divided by its sum of digits (40) gives a square (1614753856 = 40184²).

The spelling of 64590154240 in words is "sixty-four billion, five hundred ninety million, one hundred fifty-four thousand, two hundred forty".