621154064 has 20 divisors (see below), whose sum is σ = 1226194956. Its totient is φ = 304716672.

The previous prime is 621154063. The next prime is 621154073. The reversal of 621154064 is 460451126.

It can be written as a sum of positive squares in 2 ways, for example, as 274896400 + 346257664 = 16580^2 + 18608^2 .

It is not an unprimeable number, because it can be changed into a prime (621154063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365399 + ... + 367094.

Almost surely, 2^621154064 is an apocalyptic number.

It is an amenable number.

621154064 is a deficient number, since it is larger than the sum of its proper divisors (605040892).

621154064 is a wasteful number, since it uses less digits than its factorization.

621154064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732554 (or 732548 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 621154064 is about 24922.9625847330. The cubic root of 621154064 is about 853.2306416680.

The spelling of 621154064 in words is "six hundred twenty-one million, one hundred fifty-four thousand, sixty-four".